Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 3071 by [email protected]: new assumptions system problem with
is_prime and is_even
http://code.google.com/p/sympy/issues/detail?id=3071
There is a very serious logical error in the new assumptions system when it
comes to testing whether a number is a prime or is even: in a couple of
places (handlers/ntheory.py and handlers/sets) it is using e.evalf(1) to
tell is something is an integer. This will never pass for anything but
powers of 10 since evalf evaluates 1 significant digit; it is not the same
as round(e, 1) (which is also not a good way to test if something is an
integer).
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