Zero is a number. Need I say more?

N is the set of "counting numbers".

When you count upwards you start from 1, and go up. However, when you count down you usually end on 0. Surely this means 0 satisfies the definition.

The natural numbers are derived, according to Brouwer, from our intuition of time of time by the way. From this notion, 0 is no strange idea since it marks the moment our intuition first begins ^_^

How about minus zero?

How can nothing be a number

So 0 is hard. But you know what? Tell me what none-whole number follows right after or before 0. That's right, we don't even have a thing to call that number.

My favourite part is all the replies claiming that their answer to it is correct and it's not at all controversial.

Which is funny because to a mathsless individual like me it proves how true the post is.