## Sympy expression

It aims to become a full-featured computer algebra system (CAS) while keeping the code as simple as possible in order to be comprehensible and easily extensible. sympy. share | improve this question. strategies and sympy.

So I managed to use sympy. Perform algebraic manipulations on symbolic expressions. Step3-Installing SymPy 6 Step 4-Configuringthe notebook 7 Andthat's it 8 Quickstart-Automated curvesketching g Step 1-Handlingtheinput 9 Step2-Findingthedomainofdefinition 11 Step3-Findingthe local extrema 12 Step4-Computingtheasymptotes 12 Step5-Plottingthecurve 13 Step6-Buildingthefigure 14 Top5featuresyou'llwantto knowabout 17 Creating SymPy can help a lot with the symbolic part.

In this case SymPy automatically rewrote the input expression and gave its canonical form, which is x + 1 once again. If I use solve() function is sage, it returns empty list, which is odd, but I found that it could be caused by too complex expression. As I understand, the slowness is not related to the conversion to Sympy.

I have very complex formula, and I have to solve that formula for one of variables (get some variable from expression). Interestingly Theano is still able to improve on this, again not because of additional algebraic simplification but rather due to constant Scientiﬁc Programs I Description of problem I Symbolic mathematics - SymPy expressions I Structure above expressions - derivation modeling I Transformation to target - pattern matching I Representation of target language/system - classes for C++ and Python Symbolic Computation in R João Neto October 2014. ) Taming math and physics using SymPy you need to create a SymPy expression.

Example #4 : Find derivative, integration, limits, quadratic equation. Following Python script converts a SymPy expression to Postscript expression. How to convert a sympy Matrix to numpy array The sympy module gives us the evaluate expression SymPy Goal Goal Provide a symbolic manipulation library in Python.

If you are new to SymPy, start with the Tutorial. It aims to become a full-featured computer algebra system (CAS) Recently I’ve wanted to build up purely symbolic matrix expressions using Symbol but kept running into problems because I didn’t want to add things to the SymPy core Expr that were specific to matrices. As demonstrated, the process of rejecting 2 of the possible solutions can be a bit involved.

There is also one general function called simplify() that attempts to apply all of these functions in an intelligent way to arrive at the simplest form of an expression. evalf() or N() returns the original expression, or in some cases a partially evaluated expression. SymPy does some automatic simplification of How to get sage to keep the same form as an expression from sympy? edit.

SymPy is written entirely in SymPy Goal Goal Provide a symbolic manipulation library in Python. SymPy uses Python both as the internal language and the user language. expressions.

Ask Question 0 $\begingroup$ Let's consider this simple example: a particle in a one-dimensional parabolic It’s like Mathematica, and its online shell version along with SymPy Gamma is pretty much like Wolfram Alpha (WA). A mathematical expression is represented as a tree. SymPy can simplify expressions, compute derivatives, integrals, and limits, solve equations, work with matrices, and much, much more, and do it all symbolically.

It may contain constants, variables, certain "well-known" operations (e. SymPy canonical form of expression. The norm of a complex number is different from its absolute value.

The absolute value of a complex number is defined to be the square root of its norm. As an simple example: The code 'x+2x' becomes a 'plus' expression tree with leaves symbol x and a subtree 2 times x. Here is part of my code: Sympy provides the two of them packed in a list.

It takes a floating point number and tries to simplify it: as a fraction with a small denominator, square root of a small integer, an expression involving famous constants, etc. This module provides routines for converting new symbolic expressions to other types. See sage.

I use live. args) equal to [X,Y,Z]. It provides computer algebra capabilities either as a standalone application, as a library to other applications, or live on the web as SymPy Live or SymPy Gamma.

Then we will proceed to the basics of constructing and manipulating mathematical expressions in SymPy. Float(). The list of alternatives was updated Aug 2018 There is a history of all activites on SymPy in our Activity Log.

If you copy and paste your working equation and then replace it with the symbols you are trying to use in the Python version you will get an expression that is not the same as the one you entered in the Python version: As you can see, if you work with mathematical expressions of any kind and already know basic Python, SymPy is undoubtedly useful. SymPy does only inexpensive operations; thus the expression may not be evaluated into its simplest form. To understand it you need to know that when I call some Sympy Function F over a bunch of arguments X,Y,Z, the result is an object of class “F” with a list of arguments (.

Also, the process can be different for other sets of inequalities, where the same lines of thinking might not disqualify 2 of the candidate solutions. As to whether we output garbage with these methods, we typically look to well defined benchmark problems. I tried something along these lines based on the computer algebra system SymPy [1,2].

SymPy is an open source Python library for symbolic mathematics. matrices. See the Advanced Expression Manipulation [prossimamente] section for some examples of the output of this printer.

printing. 7. In SymPy, empty args signal that we have hit a leaf of the expression tree.

Eq class is not a SymPy expression, it can be The Question: Given a sympy expression, is there an easy way to generate python code (in the end I want a . Here is a small sampling of the sort of symbolic power SymPy is capable of, to whet your appetite. blockmatrix.

The SymPy package also provides an Eq class that represents equality between two SymPy expressions. Primarily, it provides a class Converter which will walk the expression tree and make calls to methods overridden by subclasses. In mathematics, a closed-form expression is a mathematical expression that can be evaluated in a finite number of operations.

For example, suppose you had to answer the following question. The solution is to simplify your expression while doing the computations. ImmutableMatrix was added so that explicitly defined matrices could interact with other SymPy expressions.

If necessary cf. One of the projects floating around in my head since the end of last year is creating an easy to use tool that will automatically generate questions for students to test their skills either on their own or while in class. SymPyConverter for the conversion to SymPy.

This is the central page for all of SymPy’s documentation. The problem is that your integral has no (or has a hard one) analytical solution, and therefore SymPy is returning the unevaluated integral expression. Here's one: If you need to do more work on an expression then you would leave out the call to latex.

Or substitute them with more significant names. An expression is automatically transformed into a canonical form by SymPy. 0.

The point is that your expressions become huge, and that's why Sage becomes slow to perform operations (be it conversion or anything else). args and basic methods like . ML hasn't explored this very deeply; so far just using matplotlib on "lambdified" expressions.

free_symbols, y in a. A large can be found on this blog aggregator at planet. to automatically apply when transposing an expression.

The reason for their appeal is mostly due to their organization of the processes behind expression tree traversal and manipulation. These expressions can contain function calls to single-argument math functions (such as 'exp', 'sin', etc. unify frameworks the most appealing.

In various distributions you can install the package directly with the help of the corresponding package manager. Logic (sympy. This is because the square-root function per se has lots of meanings, whereas we attach here a very specific meaning to it.

Using symbolic math, we can define expressions and equations exactly in terms of symbolic variables. Classes that are designed to be part of standard symbolic expressions (like x**2*sin(x)) should subclass from Expr. \SymPy is an open source Python library for symbolic mathematics.

, x**2 + x*y. I have a list of symbolic expressions, like below: import numpy as np import sympy s = sympy. Perform basic calculus tasks (limits, differentiation and integration) with symbolic expressions.

The behavior they provide is similar to the default Python behavior, but when one of the arguments is a SymPy expression, a simplification will be attempted before the comparison is made. Can this expression be simplified? - "/sci/ - Science & Math" is 4chan's board for the discussion of science and math. I'm having problems with dot inside a conda environment (due to #1357), which also breaks the graphviz package.

SymPy can do much of the basic tasks learned during algebra: simplification, factoring and solving equations. Here i found something for you. 5, via a temporary file.

Such an expression is encapsulated by a symbolic variable x instantiated through: using SymPy x = Sym("x") x (We typeset symbolic expressions differently in this project. Basic algebra. The submatrices are stored in a SymPy Matrix object but accessed as part of a Matrix Expression >>> Use llvmlite to JIT compile Sympy expressions into executable code.

Symbol('x') y = sympy. asked 2017-08-08 18:31:19 -0500 ensaba 115 Hello, thanks for the A2A. class sympy.

In working with SymPy it is very common to make variable substitutions, such as in the creation of the Pe symbolic function below: Next we plot some BEP curves by ﬁlling arrays using a for loop, since the sympy function is not The dotprint() function in sympy. So there are two possibilities for a SymPy expression. SymPy is a Python library for symbolic mathematics.

SymPy: unable to simplify rather simple expression I have an expression (expr, see below) that I am unable to simplify in SymPy. Sympy) may be less wasteful. This is just a stripped down version of our docs, with the new tutorial that Aaron Meurer has written, adapted for SymPy 0.

First of all, it is clear that if we want neat answers, we cannot just return this expression as stated. There are basic sets (Intervals, FiniteSets) compound sets (Unions, Intersections, Cartesian Products) and operations (contains, complement, measure, subset). If the expression contains symbols or for some other reason cannot be evaluated numerically, calling .

SymPy is a package for symbolic calculations in python, similar to Mathematica. What is SymPy Personally, I’ve found the approach offered by the sympy. 2.

Sympy is pretty awesome. A simple example returning a sympy expression describing the fit of a sine function computed by Earth. See the original discussion here.

first obtaining MathML representation of SymPy expression Sympy provide rewrite function to rewrite expression in terms of other functions. Sympy has more sophisticated algebra rules and can handle a wider variety of mathematical operations (such as series, limits, and integrals). Find the position of the object at t=3 seconds, if it starts from x_i=20[m], with v_i=10[m/s] and undergoes a constant acceleration of a=5[m/s^2].

g. For example, when the expression is a polynomial in expanded form, the coefficients are evaluated: SymPy does not have a built-in graphical user interface (GUI). We reviewed how to create a SymPy expression and substitue values and variables into the expression.

SymPy¶. check if expression contains symbol [code]import sympy x = sympy. Then we created to SymPy equation objects and solved two equations for two unknowns using SymPy's solve() function.

This module is a computer algebra system (CAS) written in the Python programming language. org a lot with my students because you can bookmark an entire interactive session as a (long) URL. troubleshooting.

DimensionalAnalysis The Dimensional Analysis tool is meant to be used with spreadsheets containing variable definitions It ends up being simplest (that is the current theory at least) when using the chain rule; this was done by hand in order to ease the work done by SymPy’s routines. In the last part of this tutorial we will show how to solve simple, yet illustrative, mathematical problems with SymPy. 0 (zero) top of page .

What is SymPy SymPy is a Python library for symbolic mathematics. sympy. This is just a regular Python shell, with the following commands executed by default: Hot-keys on this page.

C is deprecated and scheduled for removal after 1. Basic Operations¶. See PR #10046.

Gr 5 reteaching answers ch 1 to 20 edugates quiz worksheet rational number addition subtraction study com untitled document quiz worksheet adding subtracting rational expressions Gr 5 Reteaching Answers Ch 1 To 20 Edugates Quiz Worksheet Rational Number Addition Subtraction Study Com Untitled Document Quiz Worksheet Adding Subtracting Rational Expressions One Step Equations Practice Worksheet Progress on Python-Powered randomized quiz generator. This is where I hope this community can assist me: Either by suggesting an alternate way of dynamically optimize my first stage for n-number of firms where I may use my expressions, or, I assume more realistically, some way of converting my Sympy-expressions into expressions that can be used in GEKKO. As you can see, if you work with mathematical expressions of any kind and already know basic Python, SymPy is undoubtedly useful.

I hope that makes # apply_along_axis is equivalent to a python loop, for simple expressions like the above, it's much slower than broadcasting from sympy import symbols as sym. Hello, thanks for the A2A. Solve polynomial and transcendental equations.

Either it has empty args, in which case it is a leaf node in any expression tree, or it has args, in which case, it is a branch node of any expression tree. from sympy import symbols, sqrt, exp, diff, integrate, pprint #Sympy can also sum expressions with the summation command. sympy does have it's own plotting capabilities for symbolic expressions (matplotlib is a back-end).

1 (one) first highlighted chunk First thing you learn in the documentation is substitution. It's unlikely that anybody ever used it; it is scheduled for removal for the next version of SymPy after 1. It's possible to update the information on SymPy or report it as discontinued, duplicated or spam.

SymPy was added by NightHeron in Jan 2013 and the latest update was made in Aug 2017. The SymPy program extends julia by providing a type for symbolic expressions. .

SymPy is trivial to install and to inspect because it is written entirely in Python with few dependencies. subs(x, y) cos(y) + 1 [/code] SymPy –> Sage conversion¶ The file consists of _sage_() methods that are added lazily to the respective SymPy objects. They are extracted from open source Python projects.

from sympy import symbols, sqrt, exp, diff, integrate, pprint Code generation allows users to speed up existing code, to deal only with the high level mathematics of a problem, avoids mathematical errors and typos, makes it possible to deal with expressions expression using the Q-function deﬁned using sympy functions, where we deﬁne and . OK, I know you can ask WA some pretty cool questions, but let’s face it, most of use just want to find the derivative of a function, or simplify an expression, and not compare the GDP of Nigeria with the profit of Google. This class permits the plotting of sympy expressions using numerous backends (matplotlib, textplot, the old pyglet module for sympy, Google charts api, etc).

free_symbols (True, True) > SymPy is a Python library for symbolic mathematics. It's likely to be much easier to get the Python code working at the IPy prompt, and only then firewall it away within the scripting engine. Any call of the _sympy_() method of a symbolic expression will trigger the addition.

These functions inspect the expression tree, draw out the Planet SymPy Guidelines. First thing you learn in the documentation is substitution. For real and positive x, expr is equivalent to x**3 + 2*x, but simplify and refine do not simplify the expression at all.

Symbol('y') a = 4 + x**2 + y b = 4 + y**2 >>> x in a. For the most part, one can work with symbolic expressions without pulling them back into julia expressions until needed. There is no realiable way to recognise and transform such expressions later.

It’s like Mathematica, and its online shell version along with SymPy Gamma is pretty much like Wolfram Alpha (WA). Conversion of symbolic expressions to other types¶. The SymEngine backend and Theano functions really didn’t give any improvements for the kind of low-dimensional vector calculations performed for control SymPy can help a lot with the symbolic part.

[code]>>> expr = cos(x) + 1 >>> expr. The above code solves the problem of rendering the graphviz tree representation of Sympy expressions in Python 3. arithmetic operators 9 Introduction to SymPy Lab Objective: Most implementations of numerical algorithms focus on crunching, relating, or Symbolic Variables and Expressions This is because SymPy assumes by default that expressions are identically with Symbol and visually present solution to partial fraction decomposition of \ replace standard sympy variable declarations like x=Symbol(’x’) with code like x=Normal(’x’,0,1) and continue to use standard SymPy without modiﬁcation.

0, too. The dotprint() function in sympy. The math is approachable well structured.

Symbolic mathematics represents the use of computers to manipulate mathematical equations and expressions in Part of sympy is the pretty print functionality that uses unicode characters to prettify symbolic expressions in the command-line environments with unicode support. , nth root, exponent, logarithm, trigonometric functions, and inverse hyperbolic functions), but usually no limit. The syntax is Python so feels a little weird for doing math, but the SymPy function names match very closely to the math verbs like solve, expand, simplify, factor, which is very good for learning.

Solve some differential equations. Welcome to SymPy’s documentation!¶ SymPy is a Python library for symbolic mathematics. ) SymPy Trigonometryfrom sympy import sin, cos, tan, trigsimp, expand_trig Thetrigonometricfunctions,suchassin andcos takeninputsin radians.

plot. , + − × ÷), and functions (e. The following are 24 code examples for showing how to use sympy.

7,numpy,scipy,sympy. Quick Tip To play with the srepr form of expressions in the SymPy Live shell, change the output format to Repr in the settings. With hands-on examples and practical advice, you will learn everything you need to integrate SymPy into your workflow and to make the best use of its functionalities.

Integration and Differentiation Sympy is made for symbolic math, so let's have a look at some basic integration and differentiation. 4 and SymPy 0. free_symbols (True, True) > This introduces a MatrixSymbol type which can be used to describe a matrix without explicitly stating its entries.

The pure-SymPy simplified result is again substantially more efficient (13 operations). This section provides an overview of what sympy is, and why a developer might want to use it. Sympy tells us it's 3x.

SymPy Live is SymPy running on the Google App Engine. For example in Ubuntu: apt-get install python-sympy For the latest version, you can use pip: pip install sympy Code Step3-Installing SymPy 6 Step 4-Configuringthe notebook 7 Andthat's it 8 Quickstart-Automated curvesketching g Step 1-Handlingtheinput 9 Step2-Findingthedomainofdefinition 11 Step3-Findingthe local extrema 12 Step4-Computingtheasymptotes 12 Step5-Plottingthecurve 13 Step6-Buildingthefigure 14 Top5featuresyou'llwantto knowabout 17 Creating trying out the Sympy simplify function, trying out SymEngine, trying out the Sympy compile to Theano function, trying out the Sympy autowrap function, and; various combinations of the above. Note the common sub-expressions like 56*x below.

A workaround is to collect the names of the variables appearing in the solution(s) and declare them as vars if they have to be used outside the call context. This is a very important behavior: all expressions are subject to automatic evaluation, during which SymPy tries to find a canonical form for expressions, but it doesn’t apply “heroic” measures to achieve this goal. solve(), but it returns exception.

j k next/prev highlighted chunk . These expressions can get quite large, so minimizing the buildup of expression size is important. However, for the purpose of my project, I need them i Personally, I’ve found the approach offered by the sympy.

1 (one) first highlighted chunk numerical value for an expression in sympy. SymPy Tutorial for SciPy 2013¶. Planet SymPy is one of the public faces of the SymPy project and is read by many users and potential contributors.

The standard SymPy Expr wasn’t really designed with Matrices in mind and I found that this was holding me back a bit. #First, do some sums over powers of integers print "Sum of integer powers n^k from 1 to 100: k = 1, 2, 3" The following are 24 code examples for showing how to use sympy. This is the tutorial that Aaron Meurer and Ondřej Čertík will be giving at SciPy 2013 for SymPy.

sympy - manipulate expressions containing commutator. If you liked this or have experimented with your own implementations of Python, regex, and/or SymPy to do cool and useful things please share in the comments below. Here is the code I wrote for that.

IntroductionComputer PerformanceSoftware and Documentation Licenses Application SoftwareSoftware and OS ChoicesVirtualization Computing Consider computing in a broad sense - not just Computer Science . Then you take that answer and put that back on the right-hand side. python expression sympy.

sympy documentation: Getting started with sympy. edited Aug 10 lambdify ¶. Do symbolic work with sympy, and then switch by "lambdifying" symbolic exressions, turning them into python functions.

The Theano version looks a lot like the unsimplified SymPy version. dot prints output to dot format, which can be rendered with Graphviz. SymPy’s sets module is a pleasure to work on.

A place for redditors/serious people to discuss quantitative trading, statistical methods, econometrics, programming, implementation, automated strategies and bounce ideas off each other for constructive criticism, feel free to submit papers/links of things you find interesting. Unlike many other CAS’s, SymPy is designed to be used in an extensible way: both as an end-user application and as a library. The plot supports the idea that the it is the inherent complexity of the mathematical expression that determines the execution time.

subs(x, y) cos(y) + 1 [/code] It also did not help — as I labored under the delusion that I was slowly feeding new facts into SymPy — that each time I should have written Eq(a, b + 2) I instead tended to write a = b + 2 which, per the usual rules of Python assignment, destroys the symbol a and replaces it with an expression object. subs and evalf are good if you want to do simple evaluation, but if you intend to evaluate an expression at many points, there are more efficient ways. subs() should only subclass from Basic.

Trying IPy 2. However, SymPy exposes a rich interactive display system, and supports registering printers with Jupyter frontends, including the Notebook and Qt Console, which will render SymPy expressions using MathJax or \(\LaTeX\) L A T E X Evaluate expressions with arbitrary precision. While the symbolic_equation.

The content aggregated at Planet SymPy is the opinions of its authors, but the sum of that content gives an impression of the project. More generic objects that do not work in symbolic expressions but still want the basic SymPy structure like . To Convert sympy matrix objects to numpy arrays.

Exporting a fitted Earth models as a sympy expression¶. When you have simple but big calculations that are tedious to be solved by hand, feed them to SymPy, and at least you can be sure it will make no calculation mistake ;-) The basic functionalities of SymPy are expansion/factorization I'm having problems with dot inside a conda environment (due to #1357), which also breaks the graphviz package. The class provided by SymPy and the class provided by this package are not interchangeable: SymPy’s Eq does not track modifications or print out as multiline equations.

python,python-2. You can vote up the examples you like or vote down the exmaples you don't like. Herein we use package rSymPy that needs Python and Java instalattion (this library uses SymPy via Jython).

g. Some more advanced operations will be discussed later in the advanced expression manipulation section. For interactive work the function plot is better suited.

factor. Theano focuses more on tensor expressions than Sympy, and has more machinery for compilation. I decided to take a look at how others have handled that particular problem and discovered SymPy which is a rather mature CAS written in Python.

It works with expressions containing symbols. Expr(). If you copy and paste your working equation and then replace it with the symbols you are trying to use in the Python version you will get an expression that is not the same as the one you entered in the Python version: SymPy is an open source Python library for symbolic mathematics.

e. After ﬁnal expressions are formed the user can query them using the functions P, E, density, sample. For example, the bicycle problem that runs as a test in the sympy test suite checks the accuracy of the evaluation to something like 14 decimal places against an independently derived system from a number of other methods.

The closest Python package to Theano is sympy. Hello! I have some equations which I read from a file, and then turn into sympy expressions and I need the variables that appear in each equation. Let us take the expression x2 + xy , i.

pyc file)? I imagine this code I was playing around with SymPy, a symbolic math package for Python, and ran across nsimplify. Instead of reinventing the wheel I then begun leveraging SymPy and its symbolic expression handling for my purposes. One might note that other solvers (e.

py or perhaps a . Because all the leaves are symbolic it matches a Sympy Add rule so we try to evaluate it with Sympy. The last equation is an implicit expression and can be solved by substituting a 'guess' into the right-hand side.

Just a few new commands are needed. 5 gets you a nice stack trace It can solve equations, differentiate or integrate, simplify complex expressions or evaluate mathematical functions. This is the last of a three part series connecting SymPy and Theano to transform mathematical expressions into efficient numeric code (see part 1 and part 2).

logic) Boolean expressions, equivalence testing, satisfiability, and normal forms. SymPy is written entirely in Python and does not require any external libraries, except optionally for plotting support. r m x p toggle line displays .

BlockMatrix [source] ¶ A BlockMatrix is a Matrix composed of other smaller, submatrices. SymPy expressions are immutable trees of Python objects. SymPy is a Python library for symbolic computation.

Here we discuss some of the most basic operations needed for expression manipulation in SymPy. org. SymPy has dozens of functions to perform various kinds of simplification.

This last figure shows the linear relation between execution times of the compiled Sympy expressions and native Numpy lambda function. matrices) Tools for creating matrices of symbols and expressions. January 6, 2010.

In a=6, b=5, c=2 this case how to calculate expression using sympy in python? Please help me. sympy free download. Plot(*args, **kwargs) [source] ¶ The central class of the plotting module.

# apply_along_axis is equivalent to a python loop, for simple expressions like the above, it's much slower than broadcasting from sympy import symbols as sym. Symbol('s') x = [ s, s+1, 10*s**2, 5] After adding the elements Instant SymPy Starter is an introduction to the exciting world of symbolic computation in Python. You can sympify any expressionx2 −4x+ 7,thatis,youwanttoﬁndconstantshandk Evaluate expressions with arbitrary precision.

expression_conversion. It is one of the layers used in SageMath, the free open-source alternative to Maple/Mathematica/Matlab. It does this.

From this answer a 'times' expression tree is constructed which is then printed out. Matrices (sympy. Uh oh! Until now, we haven't encountered an expression where the left-hand side $\phi$ has itself on the right-hand side.

Rewrites expression containing applications of functions of one kind in terms of functions of different kind. For example, in my Ubuntu machine and in its gnome-terminal running the following code This uses the sympy symbolic math library to calculate the CG coefficient symbolically, then evaluates the resulting expression numerically. The submatrices are stored in a SymPy Matrix object but accessed as part of a Matrix Expression >>> Exporting a fitted Earth models as a sympy expression¶.

Sympy is a handy and accessible Python library that is used in symbolic mathematics. We have seen that it is simple and computationally profitable to combine the best parts of both projects. A new family of expression types were also added: Transpose, Inverse, Trace, and BlockMatrix.

plotting. The initial implementation only works with scalar expressions. symbolic.

Hot-keys on this page. For example, if you wanted to evaluate an expression at a thousand points, using SymPy would be far slower than it needs to be, especially if you only care about machine precision. ClassRegistry is deprecated.

The performance is not actually too horrible due to memoization, but there is an annoying ~1 second hit on startup time because I have to load sympy. Equations. We will also discuss the most common issues and differences from other computer algebra systems, and how to deal with them.

For example you can rewrite trigonometric functions as complex exponentials or combinatorial functions as gamma function. Before we can do this, we need to understand how expressions are represented in SymPy. SymPy: SymPy is a Python library for symbolic mathematics.

sympy expression

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