Theorem 7p1e8 9426

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 9351	. 2 |- 8 = ( 7 + 1 )
2	1	eqcomi 2242	1 |- ( 7 + 1 ) = 8

Syntax hints:   = wceq 1402  (class class class)co 6078   1c1 8173   + caddc 8175   7c7 9342   8c8 9343

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1500  ax-gen 1502  ax-ext 2220

This theorem depends on definitions:  df-bi 117  df-cleq 2231  df-8 9351

This theorem is referenced by:  7t4e28  9869  9t9e81  9887