Theorem 6p1e7 9443

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 9368	. 2 |- 7 = ( 6 + 1 )
2	1	eqcomi 2242	1 |- ( 6 + 1 ) = 7

This proof depends on syntax axioms:   = wceq 1402  (class class class)co 6085   1c1 8180   + caddc 8182   6c6 9359   7c7 9360

This proof depends on 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 proof depends on definitions:  df-bi 117  df-cleq 2231  df-7 9368

This theorem is used by:  9t8e72  9904  log2ublem3  16085  log2ublog2  16086