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Theorem ex-or 10248
Description: Example for ax-io 640. 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
StepHypRef Expression
1 eqid 2056 . 2 4 = 4
21olci 661 1 (2 = 3 ∨ 4 = 4)
Colors of variables: wff set class
Syntax hints:  wo 639   = wceq 1259  2c2 8039  3c3 8040  4c4 8041
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 103  ax-ia2 104  ax-ia3 105  ax-io 640  ax-gen 1354  ax-ext 2038
This theorem depends on definitions:  df-bi 114  df-cleq 2049
This theorem is referenced by: (None)
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