Theorem eleqtrrid 2295

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 2211	. 2 |- ( ph -> B = C )
4	1, 3	eleqtrid 2294	1 |- ( ph -> A e. C )

Syntax hints:   -> wi 4   = wceq 1373   e. wcel 2176

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 1470  ax-gen 1472  ax-ie1 1516  ax-ie2 1517  ax-4 1533  ax-17 1549  ax-ial 1557  ax-ext 2187

This theorem depends on definitions:  df-bi 117  df-cleq 2198  df-clel 2201

This theorem is referenced by:  rabsnt  3708  exmid1stab  4252  0elnn  4667  canth  5897  tfrexlem  6420  rdgtfr  6460  rdgruledefgg  6461  exmidonfinlem  7301  hashinfom  10923  swrds1  11121  ennnfonelemhom  12786  fnpr2ob  13172