Theorem 3ne0

Description: The number 3 is nonzero. (Contributed by FL, 17-Oct-2010) (Proof shortened by Andrew Salmon, 7-May-2011)

	Ref	Expression
Assertion	3ne0	|- 3 =/= 0

Proof

Step	Hyp	Ref	Expression
1		3nn	|- 3 e. NN
2	1	nnne0i	|- 3 =/= 0