# sympy

https://github.com/sympy/sympy

## Python

A computer algebra system written in pure Python

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## Help out

- Issues
- `subs` method of expressions no longer "sympifies" strings
- Add new error raise conditions to Fourier Transform
- Document and warn when solve_poly_system misses solutions not expressible by radicals
- Fourier transform of exponential returns 0
- Improved free_group documentation
- Piecewise: piecewise_fold, _eval_interval and _eval_integral overhaul
- Wrong measurement for one qubit state.
- Infinite recursion trying to evaluate non-converging integral
- Can't solve integrate(abs(x**2-3*x), (x, -15, 15))
- SymPy can't compare real numbers?
- Taylor expansion wrong (likely because of wrong substitution at point of evaluation?)
- limit(-LambertW(-log(t))/log(t), t, 1) crashes with RecursionError
- Add functionality to crypto module
- Units broken in 1.0.1 (master branch)
- Simplify constant coefficients
- Non-commutative multiply triggers inappropriate substitutions
- Matrix Norm for order 1 under development
- Matrix norm for order 1 added.
- problem with polygamma or im
- Can't solve limit(x**2 + x*sin(x) + cos(x), x, -oo)

- Docs