Simon King wrote: > If one really wants to know whether R is provably not a field, then > one asks R.is_field()==False.
A short aside unrelated to the general discussion, but good to know: it's usually much faster to do "some_value is False", since that is a pointer comparison. Also, 0==False is true, where I don't think that's what you want in the above test. sage: %timeit None==False 1000000 loops, best of 3: 264 ns per loop sage: %timeit None is False 10000000 loops, best of 3: 171 ns per loop sage: a=3 sage: %timeit a==False 100000 loops, best of 3: 2.82 µs per loop sage: %timeit a is False 10000000 loops, best of 3: 211 ns per loop sage: 0==False True sage: 0 is False False Jason --~--~---------~--~----~------------~-------~--~----~ To post to this group, send an email to [email protected] To unsubscribe from this group, send an email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
