I am running SageMath 10.6 (downloaded from binary) in a terminal under MacOS. The following happens:
sage: x = [[0],[0]]
sage: Set(x)
Set of elements of [[0], [0]]
sage: Set(x).cardinality()
2
There may be a workaround, but this shouldn't happen, should it?
I think that in general, if you create a Set with elements that are not hashable, it will not behave perfectly. If you used x = [(0,), (0,)] instead, or equivalently
sage: x = [[0], [0]]
sage: y = [tuple(L) for L in x]
sage: Set(y)
then this will be better behaved.
Asked: 2025-11-25 14:14:31 +0100
Seen: 55 times
Last updated: Nov 26
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It's a known issue - see https://github.com/sagemath/sage/issu...