Theorem 19.21adOLD 1407

Description: Deduction from Theorem 19.21 of [Margaris] p. 90.

Hypotheses

Ref	Expression
19.21ad.1	|- (ph -> A.xph)
19.21ad.2	|- (ps -> A.xps)
19.21ad.3	|- (ph -> (ps -> ch))

Assertion

Ref	Expression
19.21adOLD	|- (ph -> (ps -> A.xch))

Proof of Theorem 19.21adOLD

Step	Hyp	Ref	Expression
1		19.21ad.1	. . . 4 |- (ph -> A.xph)
2		19.21ad.2	. . . 4 |- (ps -> A.xps)
3	1, 2	hban 1356	. . 3 |- ((ph /\ ps) -> A.x(ph /\ ps))
4		19.21ad.3	. . . 4 |- (ph -> (ps -> ch))
5	4	imp 377	. . 3 |- ((ph /\ ps) -> ch)
6	3, 5	19.21ai 1345	. 2 |- ((ph /\ ps) -> A.xch)
7	6	ex 402	1 |- (ph -> (ps -> A.xch))

Syntax hints:   -> wi 3   /\ wa 240  A.wal 1296

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-gen 1305  ax-4 1319  ax-5o 1321  ax-6o 1324

This theorem depends on definitions:  df-bi 164  df-an 242

Copyright terms: Public domain