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 1398   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 1496  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-4 1559  ax-17 1575  ax-ial 1583  ax-ext 2213

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

This theorem is referenced by:  rabsnt  3750  exmid1stab  4304  0elnn  4723  canth  5979  tfrexlem  6543  rdgtfr  6583  rdgruledefgg  6584  exmidonfinlem  7464  hashinfom  11103  swrds1  11315  ennnfonelemhom  13116  fnpr2ob  13503  upgrex  16044  upgr1een  16065  wlkl1loop  16299