Talk:Armor/@comment-4890669-20120304194247/@comment-4087140-20120305002447

Excluding one qualifier implies that the answer will be different. The overlapping case is a trivial one and is not going to cause any confusion.

And, strictly speaking, there aren't two answers. Solving an equation for a variable yields a solution set, and in set theory {a,a} = {a}. In this case, the solution set for when armor equals zero is {1,1}, which is equivalent to {1}, which is only one answer. The function remains a function.