Theorem pm2.61iine 2884

Description: Equality version of pm2.61ii 177. (Contributed by Scott Fenton, 13-Jun-2013.) (Proof shortened by Wolf Lammen, 25-Nov-2019.)

Hypotheses

Ref	Expression
pm2.61iine.1	|- ( ( A =/= C /\ B =/= D ) -> ph )
pm2.61iine.2	|- ( A = C -> ph )
pm2.61iine.3	|- ( B = D -> ph )

Assertion

Ref	Expression
pm2.61iine	|- ph

Proof of Theorem pm2.61iine

Step	Hyp	Ref	Expression
1		pm2.61iine.2	. 2 |- ( A = C -> ph )
2		pm2.61iine.3	. . . 4 |- ( B = D -> ph )
3	2	adantl 482	. . 3 |- ( ( A =/= C /\ B = D ) -> ph )
4		pm2.61iine.1	. . 3 |- ( ( A =/= C /\ B =/= D ) -> ph )
5	3, 4	pm2.61dane 2881	. 2 |- ( A =/= C -> ph )
6	1, 5	pm2.61ine 2877	1 |- ph

Syntax hints:   -> wi 4   /\ wa 384   = wceq 1483   =/= wne 2794

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This theorem depends on definitions:  df-bi 197  df-an 386  df-ne 2795

This theorem is referenced by:  fntpb  6473  elfiun  8336  dedekind  10200  mdsymi  29270