Dear all, I do this: declare(n,integer); askinteger(n-1/2); is (2n-1)/2 an integer? why is it asking me this? Isn't it clear that this is never an integer? also: featurep(n-1/2,integer); false featurep seems to be more knowledgeable than askinteger. Does it do more than askinteger? Best, Nijso