On 2016-02-05 19:59, William Stein wrote:
Maybe is_prime for field elements should just raise an exception?
This reminds me very much about the recent discussion we had about floor division... and which didn't really come to a conclusion.
It's really the same problem: you have something which makes mathematical sense but only in a way that people usually don't use it: If you're working with elements of a field, you normally won't call is_prime (even though that's well-defined) or do floor division (even though a field is trivially an Euclidean domain).
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