Theorem sylanblrc 420

Description: Syllogism inference combined with a biconditional. (Contributed by BJ, 25-Apr-2019.)

Hypotheses

Ref	Expression
sylanblrc.1	|- ( ph -> ps )
sylanblrc.2	|- ch
sylanblrc.3	|- ( th <-> ( ps /\ ch ) )

Assertion

Ref	Expression
sylanblrc	|- ( ph -> th )

Proof of Theorem sylanblrc

Step	Hyp	Ref	Expression
1		sylanblrc.1	. 2 |- ( ph -> ps )
2		sylanblrc.2	. 2 |- ch
3		sylanblrc.3	. . 3 |- ( th <-> ( ps /\ ch ) )
4	3	biimpri 133	. 2 |- ( ( ps /\ ch ) -> th )
5	1, 2, 4	sylancl 417	1 |- ( ph -> th )

This proof depends on syntax axioms:   -> wi 4   /\ wa 104   <-> wb 105

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108

This proof depends on definitions:  df-bi 117

This theorem is used by:  cosmul  12512  ismgmid  13697  mndideu  13739  cdivcncfap  15705  dvrecap  15814