#14350: Implement multiplicative inverses of cycle index series
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Reporter: agd | Owner: agd
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.10
Component: combinatorics | Resolution:
Keywords: species, cycle index | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Andrew Gainer-Dewar | Merged in:
Dependencies: | Stopgaps:
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Old description:
> In the context of virtual species (see #14348), it is also possible to
> define multiplicative inverses of many species. This patch incorporates
> code to compute the cycle indices of these multiplicative inverse species
> and a __div__ method for cycle index series.
New description:
In the context of virtual species (see #14348), it is also possible to
define multiplicative inverses of many species. This patch incorporates
code to compute the cycle indices of these multiplicative inverse species
and a __div__ method for cycle index series.
Apply [attachment:trac_14350_cycle_index_mult_inverses.patch]
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Comment (by chapoton):
for the bot: apply trac_14350_cycle_index_mult_inverses.patch
You should use python3 syntax for raise:
{{{
raise ValueError("constant term must be non-zero")
}}}
you could avoid to define parent by using directly self.parent()
you should doctest the _div_ function
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14350#comment:11>
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