Theorem ex-or 28661

Description: Example for df-or 848. Example by David A. Wheeler. (Contributed by Mario Carneiro, 9-May-2015.)

Assertion

Ref	Expression
ex-or	⊢ (2 = 3 ∨ 4 = 4)

Proof of Theorem ex-or

Step	Hyp	Ref	Expression
1		eqid 2739	. 2 ⊢ 4 = 4
2	1	olci 866	1 ⊢ (2 = 3 ∨ 4 = 4)

Syntax hints:   ∨ wo 847   = wceq 1543  2c2 11933  3c3 11934  4c4 11935

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2016  ax-9 2122  ax-ext 2710

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 848  df-ex 1788  df-cleq 2731

This theorem is referenced by: (None)