Am 2014-12-01 um 19:37 schrieb Nils Bruin:
> Interval fields apparently hide this (intervals are "equal" if they have
> non-empty intersection?), but of course hash cannot respect this, because this
ComplexIntervalFieldElement.__richcmp__ says:
As with the real interval fields this never returns false positives.
Thus, `a == b` is ``True`` iff both `a` and `b` represent the same
one-point interval. Likewise `a != b` is ``True`` iff `x != y` for all
`x \in a, y \in b`.
Note the "one-point interval". Therefore,
sage: a = CIF(RIF(0, 1), RIF(0, 1))
sage: a is a
True
sage: a == a
False
So equality is not even reflexive.
Regards, CH
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