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Theorem iidn3 27545
Description: idn3 27667 without virtual deduction connectives. Special theorem needed for Alan Sare's virtual deduction translation tool. (Contributed by Alan Sare, 23-Jul-2011.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
iidn3  |-  ( ph  ->  ( ps  ->  ( ch  ->  ch ) ) )

Proof of Theorem iidn3
StepHypRef Expression
1 id 19 . 2  |-  ( ch 
->  ch )
21a1ii 24 1  |-  ( ph  ->  ( ps  ->  ( ch  ->  ch ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4
This theorem is referenced by:  trintALT  27937
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 8
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