Theorem 7p1e8 8171

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 8104	. 2 ⊢ 8 = (7 + 1)
2	1	eqcomi 2085	1 ⊢ (7 + 1) = 8

Syntax hints:   = wceq 1284  (class class class)co 5532  1c1 6982   + caddc 6984  7c7 8094  8c8 8095

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-5 1376  ax-gen 1378  ax-ext 2063

This theorem depends on definitions:  df-bi 115  df-cleq 2074  df-8 8104

This theorem is referenced by:  7t4e28  8587  9t9e81  8605