Theorem 7p1e8 9176

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 9101	. 2 ⊢ 8 = (7 + 1)
2	1	eqcomi 2209	1 ⊢ (7 + 1) = 8

Syntax hints:   = wceq 1373  (class class class)co 5944  1c1 7926   + caddc 7928  7c7 9092  8c8 9093

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 1470  ax-gen 1472  ax-ext 2187

This theorem depends on definitions:  df-bi 117  df-cleq 2198  df-8 9101

This theorem is referenced by:  7t4e28  9614  9t9e81  9632