Theorem neleq12d 2303

Description: Equality theorem for negated membership. (Contributed by FL, 10-Aug-2016.)

Hypotheses

Ref	Expression
neleq12d.1	|- ( ph -> A = B )
neleq12d.2	|- ( ph -> C = D )

Assertion

Ref	Expression
neleq12d	|- ( ph -> ( A e/ C <-> B e/ D ) )

Proof of Theorem neleq12d

Step	Hyp	Ref	Expression
1		neleq12d.1	. . 3 |- ( ph -> A = B )
2		neleq1 2301	. . 3 |- ( A = B -> ( A e/ C <-> B e/ C ) )
3	1, 2	syl 14	. 2 |- ( ph -> ( A e/ C <-> B e/ C ) )
4		neleq12d.2	. . 3 |- ( ph -> C = D )
5		neleq2 2302	. . 3 |- ( C = D -> ( B e/ C <-> B e/ D ) )
6	4, 5	syl 14	. 2 |- ( ph -> ( B e/ C <-> B e/ D ) )
7	3, 6	bitrd 177	1 |- ( ph -> ( A e/ C <-> B e/ D ) )

Syntax hints:   -> wi 4   <-> wb 98   = wceq 1243   e/ wnel 2205

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-in1 544  ax-in2 545  ax-5 1336  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-4 1400  ax-17 1419  ax-ial 1427  ax-ext 2022

This theorem depends on definitions:  df-bi 110  df-cleq 2033  df-clel 2036  df-nel 2207

This theorem is referenced by: (None)