I'm not sure if it is more common to say that 0 is a natural number. There's a math.stackexchange thread about this which seems to have equally many people sayi

I'm not sure if it is more common to say that 0 is a natural number. There's a math.stackexchange thread about this which seems to have equally many people saying that each is the more common one. http://math.stackexchange.com/questions/283/is-0-a-natural-number http://math.stackexchange.com/questions/283/is-0-a-natural-n... (I count 4 people saying {1,2,3,...} is more common vs 3 saying {0,1,2,...} is more common. I also notice that N_0 is used by both sides to refer "unambiguously" to the convention of the other side.) In my experience {1,2,3,...} is used more in number theory, and {0,1,2,...} is used more in logic.