Theorem 7p1e8 7827

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 7759	. 2 |- 8 = ( 7 + 1)
2	1	eqcomi 2041	1 |- ( 7 + 1) = 8

Syntax hints:   = wceq 1242  (class class class)co 5455   1c1 6712   + caddc 6714   7c7 7749   8c8 7750

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-5 1333  ax-gen 1335  ax-ext 2019

This theorem depends on definitions:  df-bi 110  df-cleq 2030  df-8 7759

This theorem is referenced by:  7t4e28  8227  9t9e81  8245