Theorem stoic3 1320

Description: Stoic logic Thema 3.

Statement T3 of [Bobzien] p. 116-117 discusses Stoic logic thema 3.

"When from two (assemblies) a third follows, and from the one that follows (i.e., the third) together with another, external external assumption, another follows, then other follows from the first two and the externally co-assumed one. (Simp. Cael. 237.2-4)" (Contributed by David A. Wheeler, 17-Feb-2019.)

Hypotheses

Ref	Expression
stoic3.1	|- ( ( ph /\ ps ) -> ch )
stoic3.2	|- ( ( ch /\ th ) -> ta )

Assertion

Ref	Expression
stoic3	|- ( ( ph /\ ps /\ th ) -> ta )

Proof of Theorem stoic3

Step	Hyp	Ref	Expression
1		stoic3.1	. . 3 |- ( ( ph /\ ps ) -> ch )
2		stoic3.2	. . 3 |- ( ( ch /\ th ) -> ta )
3	1, 2	sylan 267	. 2 |- ( ( ( ph /\ ps ) /\ th ) -> ta )
4	3	3impa 1099	1 |- ( ( ph /\ ps /\ th ) -> ta )

Syntax hints:   -> wi 4   /\ wa 97   /\ w3a 885

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101

This theorem depends on definitions:  df-bi 110  df-3an 887

This theorem is referenced by:  f1imaeng  6272  absdiflt  9688  absdifle  9689