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Theorem ax46to6 2103
Description: Re-derivation of ax-6o 2076 from ax46 2101. Only propositional calculus is used for the re-derivation. (Contributed by Scott Fenton, 12-Sep-2005.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
ax46to6  |-  ( -. 
A. x  -.  A. x ph  ->  ph )

Proof of Theorem ax46to6
StepHypRef Expression
1 pm2.21 100 . 2  |-  ( -. 
A. x  -.  A. x ph  ->  ( A. x  -.  A. x ph  ->  A. x ph )
)
2 ax46 2101 . 2  |-  ( ( A. x  -.  A. x ph  ->  A. x ph )  ->  ph )
31, 2syl 15 1  |-  ( -. 
A. x  -.  A. x ph  ->  ph )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4   A.wal 1527
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-4 2074  ax-6o 2076
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