Theorem pm5.74da 439

Description: Distribution of implication over biconditional (deduction form). (Contributed by NM, 4-May-2007.)

Hypothesis

Ref	Expression
pm5.74da.1	|- ( ( ph /\ ps ) -> ( ch <-> th ) )

Assertion

Ref	Expression
pm5.74da	|- ( ph -> ( ( ps -> ch ) <-> ( ps -> th ) ) )

Proof of Theorem pm5.74da

Step	Hyp	Ref	Expression
1		pm5.74da.1	. . 3 |- ( ( ph /\ ps ) -> ( ch <-> th ) )
2	1	ex 114	. 2 |- ( ph -> ( ps -> ( ch <-> th ) ) )
3	2	pm5.74d 181	1 |- ( ph -> ( ( ps -> ch ) <-> ( ps -> th ) ) )

Syntax hints:   -> wi 4   /\ wa 103   <-> wb 104

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

This theorem depends on definitions:  df-bi 116

This theorem is referenced by:  ralbida  2429  elrab3t  2834  dff13  5662  fsumparts  11232  isprm3  11788  cnntr  12383  metcnp  12670  limcdifap  12789