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Theorem ax-12 1335
Description: Rederive the original version of the axiom from ax-i12 1331. (Contributed by Mario Carneiro, 3-Feb-2015.)
Assertion
Ref Expression
ax-12

Proof of Theorem ax-12
StepHypRef Expression
1 ax-i12 1331 . . . 4
21ori 620 . . 3
32ord 621 . 2
4 ax-4 1333 . 2
53, 4syl6 27 1
Colors of variables: wff set class
Syntax hints:   wn 3   wi 4   wo 608  wal 1266   wceq 1324
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 97  ax-ia2 98  ax-ia3 99  ax-in2 528  ax-io 609  ax-i12 1331  ax-4 1333
This theorem depends on definitions:  df-bi 108
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