Theorem sylanl1 402

Description: A syllogism inference. (Contributed by NM, 10-Mar-2005.)

Hypotheses

Ref	Expression
sylanl1.1	|- ( ph -> ps )
sylanl1.2	|- ( ( ( ps /\ ch ) /\ th ) -> ta )

Assertion

Ref	Expression
sylanl1	|- ( ( ( ph /\ ch ) /\ th ) -> ta )

Proof of Theorem sylanl1

Step	Hyp	Ref	Expression
1		sylanl1.1	. . 3 |- ( ph -> ps )
2	1	anim1i 340	. 2 |- ( ( ph /\ ch ) -> ( ps /\ ch ) )
3		sylanl1.2	. 2 |- ( ( ( ps /\ ch ) /\ th ) -> ta )
4	2, 3	sylan 283	1 |- ( ( ( ph /\ ch ) /\ th ) -> ta )

Syntax hints:   -> wi 4   /\ wa 104

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108

This theorem is referenced by:  adantlll  480  adantllr  481  adantl3r  512  isocnv  5858  mapxpen  6909  nqnq0pi  7505  nqpnq0nq  7520  addnqprl  7596  addnqpru  7597  pcqmul  12472  infpnlem1  12528  setsn0fun  12715  gsumfzz  13127  dvmptfsum  14961