3.4-3.5

What I learned from this reading is if two integers x and y and both even or both odd they are of the same parity, and if one is odd while the other is even they are of different parity.  I always thought this was something but I didn't know the specific name that it had assigned to this property.  Another tip I thought was important was when you are evaluating a proof you need to solve it for the general case, and you can't just assign a specific number that works for the proof, or you haven't solved it for all cases.