Theorem 3adant3l 1229

Description: Deduction adding a conjunct to antecedent. (Contributed by NM, 8-Jan-2006.)

Hypothesis

Ref	Expression
3adant1l.1	|- ( ( ph /\ ps /\ ch ) -> th )

Assertion

Ref	Expression
3adant3l	|- ( ( ph /\ ps /\ ( ta /\ ch ) ) -> th )

Proof of Theorem 3adant3l

Step	Hyp	Ref	Expression
1		3adant1l.1	. . . 4 |- ( ( ph /\ ps /\ ch ) -> th )
2	1	3com13 1203	. . 3 |- ( ( ch /\ ps /\ ph ) -> th )
3	2	3adant1l 1225	. 2 |- ( ( ( ta /\ ch ) /\ ps /\ ph ) -> th )
4	3	3com13 1203	1 |- ( ( ph /\ ps /\ ( ta /\ ch ) ) -> th )

Syntax hints:   -> wi 4   /\ wa 103   /\ w3a 973

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  df-3an 975

This theorem is referenced by:  addassnqg  7344  mulassnqg  7346  prarloc  7465  prmuloc  7528  addasssrg  7718  axaddass  7834