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Theorem 3eltr4i 2503
Description: Substitution of equal classes into membership relation. (Contributed by Mario Carneiro, 6-Jan-2017.)
Hypotheses
Ref Expression
3eltr4.1  |-  A  e.  B
3eltr4.2  |-  C  =  A
3eltr4.3  |-  D  =  B
Assertion
Ref Expression
3eltr4i  |-  C  e.  D

Proof of Theorem 3eltr4i
StepHypRef Expression
1 3eltr4.2 . 2  |-  C  =  A
2 3eltr4.1 . . 3  |-  A  e.  B
3 3eltr4.3 . . 3  |-  D  =  B
42, 3eleqtrri 2489 . 2  |-  A  e.  D
51, 4eqeltri 2486 1  |-  C  e.  D
Colors of variables: wff setvar class
Syntax hints:    = wceq 1405    e. wcel 1842
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1639  ax-4 1652  ax-5 1725  ax-ext 2380
This theorem depends on definitions:  df-bi 185  df-an 369  df-ex 1634  df-cleq 2394  df-clel 2397
This theorem is referenced by:  oancom  8101  0r  9487  1sr  9488  m1r  9489  lmxrge0  28387  brsigarn  28632  sinccvglem  29890  bj-minftyccb  31192  fouriersw  37382
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