Theorem 4ne0

Description: The number 4 is nonzero. (Contributed by David A. Wheeler, 5-Dec-2018)

	Ref	Expression
Assertion	4ne0	|- 4 =/= 0

Proof

Step	Hyp	Ref	Expression
1		4nn	|- 4 e. NN
2	1	nnne0i	|- 4 =/= 0