#20009: string monoid class one not defined
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Reporter: kcrisman | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-7.1
Component: algebra | Resolution:
Keywords: | Merged in:
Authors: Karan Desai | Reviewers: Karl-Dieter Crisman,
Report Upstream: N/A | Thierry Monteil
Branch: | Work issues:
u/karandesai-96/string_monoid_class_one_not_defined| Commit:
Dependencies: | 4b9c7394508ba2cb83405fd2a44c05e5b650c7ab
| Stopgaps:
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Comment (by tmonteil):
This does not work. As such it returns the second element of the alphabet,
as an element of the string monoid:
{{{
sage: b = BinaryStrings()
sage: b.one()
1
sage: b.one() * b('001')
1001
sage: b = AlphabeticStrings()
sage: b.one()
B
}}}
What we are looking here is the neutral element for the multiplication,
which you can get as `StringMonoidElement(self, '')`.
You still need to add some doctests.
Also, why creating a `_identity_element` attribute while it is used only
once, why not directly define the identity element in the `one` method ?
--
Ticket URL: <http://trac.sagemath.org/ticket/20009#comment:9>
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