Theorem 7p1e8 8049

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 7979	. 2 ⊢ 8 = (7 + 1)
2	1	eqcomi 2044	1 ⊢ (7 + 1) = 8

Syntax hints:   = wceq 1243  (class class class)co 5512  1c1 6890   + caddc 6892  7c7 7969  8c8 7970

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 1336  ax-gen 1338  ax-ext 2022

This theorem depends on definitions:  df-bi 110  df-cleq 2033  df-8 7979

This theorem is referenced by:  7t4e28  8451  9t9e81  8469