Theorem 8p8e16

Description: 8 + 8 = 16. (Contributed by Mario Carneiro, 19-Apr-2015)

	Ref	Expression
Assertion	8p8e16	|- ( 8 + 8 ) = ; 1 6

Proof

Step	Hyp	Ref	Expression
1		8nn0	|- 8 e. NN0
2		7nn0	|- 7 e. NN0
3		5nn0	|- 5 e. NN0
4		df-8	|- 8 = ( 7 + 1 )
5		df-6	|- 6 = ( 5 + 1 )
6		8p7e15	|- ( 8 + 7 ) = ; 1 5
7	1 2 3 4 5 6	6p5lem	|- ( 8 + 8 ) = ; 1 6