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 ∈ ℕ0
2		7nn0	⊢ 7 ∈ ℕ0
3		5nn0	⊢ 5 ∈ ℕ0
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