Theorem 7p1e8 9017

Description: 7 + 1 = 8. (Contributed by Mario Carneiro, 18-Apr-2015.)

Assertion

Ref	Expression
7p1e8	⊢ (7 + 1) = 8

Proof of Theorem 7p1e8

Step	Hyp	Ref	Expression
1		df-8 8943	. 2 ⊢ 8 = (7 + 1)
2	1	eqcomi 2174	1 ⊢ (7 + 1) = 8

Syntax hints:   = wceq 1348  (class class class)co 5853  1c1 7775   + caddc 7777  7c7 8934  8c8 8935

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1440  ax-gen 1442  ax-ext 2152

This theorem depends on definitions:  df-bi 116  df-cleq 2163  df-8 8943

This theorem is referenced by:  7t4e28  9453  9t9e81  9471