Update sympy to 1.5

[antonio-rojas]

Removed merged match, updated a few doctest results

Tarball: https://github.com/sympy/sympy/releases/download/sympy-1.5/sympy-1.5.tar.gz

CC: @kiwifb @timokau @saraedum @slel

Component: packages: standard

Author: Antonio Rojas

Branch/Commit: c6d0308

Reviewer: François Bissey

Issue created by migration from https://trac.sagemath.org/ticket/28911

[antonio-rojas]

Branch: u/arojas/update_sympy_to_1_5

[antonio-rojas]

Commit: c6d0308

[antonio-rojas]

Author: Antonio Rojas

[antonio-rojas]

New commits:

c6d0308

Update sympy to 1.5

[kiwifb]

comment:3

Finally got rid of that patch? That's awesome news.

I am not familiar with lambert_w but that test in sage/symbolic/relation.py should be checked by someone who knows if it is correct. The other tests are just a matter of factorization.

[antonio-rojas]

comment:4

Both are correct,

lambert_w(±1/2) = ±(1/2)exp(-lambert_w(±1/2))

so

(2·lambert_w(±1/2))^2 = 1/exp(2·lambert_w(±1/2))

[kiwifb]

comment:5

Replying to @antonio-rojas:

Both are correct,

lambert_w(±1/2) = ±(1/2)exp(-lambert_w(±1/2))

so

(2·lambert_w(±1/2))^2 = 1/exp(2·lambert_w(±1/2))

Now, I understand, it is just another root of the equation and the order in which they are stored has changed. It all looks good to me.

[kiwifb]

Reviewer: François Bissey

[timokau]

comment:6

Thank you for taking care of this!

[fchapoton]

comment:7

9.0 is out

[vbraun]

Changed branch from u/arojas/update_sympy_to_1_5 to c6d0308