Theorem 7p1e8 9089

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 9015	. 2 |- 8 = ( 7 + 1 )
2	1	eqcomi 2193	1 |- ( 7 + 1 ) = 8

Syntax hints:   = wceq 1364  (class class class)co 5897   1c1 7843   + caddc 7845   7c7 9006   8c8 9007

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 1458  ax-gen 1460  ax-ext 2171

This theorem depends on definitions:  df-bi 117  df-cleq 2182  df-8 9015

This theorem is referenced by:  7t4e28  9525  9t9e81  9543