Theorem eleqtrrid 2321

Description: B membership and equality inference. (Contributed by NM, 4-Jan-2006.)

Hypotheses

Ref	Expression
eleqtrrid.1	|- A e. B
eleqtrrid.2	|- ( ph -> C = B )

Assertion

Ref	Expression
eleqtrrid	|- ( ph -> A e. C )

Proof of Theorem eleqtrrid

Step	Hyp	Ref	Expression
1		eleqtrrid.1	. 2 |- A e. B
2		eleqtrrid.2	. . 3 |- ( ph -> C = B )
3	2	eqcomd 2237	. 2 |- ( ph -> B = C )
4	1, 3	eleqtrid 2320	1 |- ( ph -> A e. C )

Syntax hints:   -> wi 4   = wceq 1397   e. wcel 2202

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1495  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-4 1558  ax-17 1574  ax-ial 1582  ax-ext 2213

This theorem depends on definitions:  df-bi 117  df-cleq 2224  df-clel 2227

This theorem is referenced by:  rabsnt  3746  exmid1stab  4298  0elnn  4717  canth  5968  tfrexlem  6499  rdgtfr  6539  rdgruledefgg  6540  exmidonfinlem  7403  hashinfom  11039  swrds1  11248  ennnfonelemhom  13035  fnpr2ob  13422  upgrex  15953  upgr1een  15974  wlkl1loop  16208