#8543: EmptySet is Back !
------------------------------+---------------------------------------------
Reporter: hivert | Owner: hivert
Type: defect | Status: new
Priority: major | Milestone: sage-4.3.4
Component: categories | Keywords: empty set, Testsuite
Author: Florent Hivert | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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There is currently no way to have an empty set which pass the category
tests. Indeed the current specification says: for any set {{{S}}} there
must be a method {{{S.an_element()}}} which returns an actual element
{{{x}}} such that {{{x in S}}}:
{{{
an_element = self.an_element()
tester.assert_(an_element in self, "self.an_element() is not in self")
}}}
This tests should allows {{{S}}} to be empty.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8543>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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