Symbolic limit

[rwst]

Equivalently to #21645 a symbolic limit function is needed, in this case #20179 supposes that expressions can be searched for unexpanded limit functions which is not possible if it is anonymous.

CC: @EmmanuelCharpentier

Component: symbolics

Author: Ralf Stephan

Branch/Commit: ce95d01

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/22844

[rwst]

Branch: u/rws/symbolic_limit

[rwst]

Commit: 2f5a28f

[rwst]

Author: Ralf Stephan

[sagetrac-git]

Changed commit from 2f5a28f to bd403fd

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

bd403fd

22844:internal symbolic limit function

[rwst]

comment:5

Doctest failures in src/sage/calculus/calculus.py.

[rwst]

comment:6

The latex conversion would be easily fixed. However, the fails show that there is the problem that the limit function can have either 3 or 4 arguments, the latter with an additional direction. I don't think Sage can handle this at the moment without tuples as arguments like in hypergeometric, and this would change the code substantially.

EDIT: it may be possible to use two functions; checks elsewhere would then have to be done with both. The Maxima interface would have to know about it.

[rwst]

comment:7

Maybe it is excusable in this case to write a customized __call__ member, as long as it's an internally only used function.

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

38e6441	Merge branch 'develop' into t/22844/symbolic_limit
bd0a226	22844: latex conversion, direction arg, interface cleanup

[sagetrac-git]

Changed commit from bd403fd to bd0a226

[rwst]

comment:9

Much easier: nargs=0 does the trick. Please review.

[tscrim]

comment:10

Needs a rebase over the latest develop.

[sagetrac-git]

Changed commit from bd0a226 to 14f2647

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

14f2647

Merge branch 'develop' into t/22844/symbolic_limit

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

ce95d01

Merge branch 'develop' into t/22844/symbolic_limit

[sagetrac-git]

Changed commit from 14f2647 to ce95d01

[tscrim]

Reviewer: Travis Scrimshaw

[tscrim]

comment:13

LGTM.

[rwst]

comment:14

Thanks.

[vbraun]

Changed branch from u/rws/symbolic_limit to ce95d01