On 2015-12-02 00:23, Volker Braun wrote:
IMHO undecidability has exception semantics so really there is only one
correct solution, namely raise. Otherwise you get
sage: foo() == bar() # haha both Unknown
True
But we can override __eq__ (or __richcmp__), so it could be
sage: foo() == bar() # both Unknown
False
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