Theorem 7p1e8 8553

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 8485	. 2 ⊢ 8 = (7 + 1)
2	1	eqcomi 2092	1 ⊢ (7 + 1) = 8

Syntax hints:   = wceq 1289  (class class class)co 5652  1c1 7349   + caddc 7351  7c7 8476  8c8 8477

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-5 1381  ax-gen 1383  ax-ext 2070

This theorem depends on definitions:  df-bi 115  df-cleq 2081  df-8 8485

This theorem is referenced by:  7t4e28  8985  9t9e81  9003