Theorem 6p1e7 9210

Description: 6 + 1 = 7. (Contributed by Mario Carneiro, 18-Apr-2015.)

Assertion

Ref	Expression
6p1e7	|- ( 6 + 1 ) = 7

Proof of Theorem 6p1e7

Step	Hyp	Ref	Expression
1		df-7 9135	. 2 |- 7 = ( 6 + 1 )
2	1	eqcomi 2211	1 |- ( 6 + 1 ) = 7

Syntax hints:   = wceq 1373  (class class class)co 5967   1c1 7961   + caddc 7963   6c6 9126   7c7 9127

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 1471  ax-gen 1473  ax-ext 2189

This theorem depends on definitions:  df-bi 117  df-cleq 2200  df-7 9135

This theorem is referenced by:  9t8e72  9666