#19259: subrings of the symbolic ring
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Reporter: dkrenn | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.9
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: Daniel Krenn | Reviewers:
Report Upstream: N/A | Work issues:
Branch: u/dkrenn | Commit:
/symbolic-subring | 581f3157f57c8b38390cf515e065cf62eacec306
Dependencies: | Stopgaps:
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Comment (by dkrenn):
Replying to [comment:15 behackl]:
> Hello! I started reviewing this ticket, and for now, I have the
following comments:
>
> - `is_variable_valid` --> `has_valid_variable` or `allows_variable`?
This would be a semantic improvement as the current version does not
really fit to the other `parent.is_*`-methods, IMHO.
I agree; changed.
> - While it is OK that the subring factory checks that every element in
the `vars`-tuple can be thrown into `SR` in
`SymbolicSubringFactory.create_key_and_extra_args`, the elements are not
checked for being valid identifiers. I'd suggest to do so either in the
factory, or directly in `GenericSymbolicSubring.__init__`.
Added check.
> Otherwise, this is possible:
> {{{
> sage: SR.subring(accepting_variables=(0, pi, sqrt(2), I))
> Symbolic Subring accepting the variables 0, I, pi, sqrt(2)
> }}}
Doctest added.
--
Ticket URL: <http://trac.sagemath.org/ticket/19259#comment:17>
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