Theorem 3p1e4 9242

Description: 3 + 1 = 4. (Contributed by Mario Carneiro, 18-Apr-2015.)

Assertion

Ref	Expression
3p1e4	⊢ (3 + 1) = 4

Proof of Theorem 3p1e4

Step	Hyp	Ref	Expression
1		df-4 9167	. 2 ⊢ 4 = (3 + 1)
2	1	eqcomi 2233	1 ⊢ (3 + 1) = 4

Syntax hints:   = wceq 1395  (class class class)co 6000  1c1 7996   + caddc 7998  3c3 9158  4c4 9159

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 1493  ax-gen 1495  ax-ext 2211

This theorem depends on definitions:  df-bi 117  df-cleq 2222  df-4 9167

This theorem is referenced by:  7t6e42  9686  8t5e40  9691  9t5e45  9698  fac4  10950  4bc3eq4  10990  hash4  11031  2exp16  12955  cosq23lt0  15501  binom4  15647