Theorem 3anidm12 1238

Description: Inference from idempotent law for conjunction. (Contributed by NM, 7-Mar-2008.)

Hypothesis

Ref	Expression
3anidm12.1	|- ( ( ph /\ ph /\ ps ) -> ch )

Assertion

Ref	Expression
3anidm12	|- ( ( ph /\ ps ) -> ch )

Proof of Theorem 3anidm12

Step	Hyp	Ref	Expression
1		3anidm12.1	. . 3 |- ( ( ph /\ ph /\ ps ) -> ch )
2	1	3expib 1149	. 2 |- ( ph -> ( ( ph /\ ps ) -> ch ) )
3	2	anabsi5 547	1 |- ( ( ph /\ ps ) -> ch )

Syntax hints:   -> wi 4   /\ wa 103   /\ w3a 927

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107

This theorem depends on definitions:  df-bi 116  df-3an 929

This theorem is referenced by:  3anidm13  1239  syl2an3an  1241  prarloclemarch2  7075  nq02m  7121  recexprlem1ssl  7289  recexprlem1ssu  7290  nncan  7808  dividap  8265  modqid0  9906  subsq  10192  retanclap  11178  tannegap  11184  gcd0id  11413  coprm  11566