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Theorem ercl2 6442
Description: Elementhood in the field of an equivalence relation. (Contributed by Mario Carneiro, 12-Aug-2015.)
Hypotheses
Ref Expression
ersym.1  |-  ( ph  ->  R  Er  X )
ersym.2  |-  ( ph  ->  A R B )
Assertion
Ref Expression
ercl2  |-  ( ph  ->  B  e.  X )

Proof of Theorem ercl2
StepHypRef Expression
1 ersym.1 . 2  |-  ( ph  ->  R  Er  X )
2 ersym.2 . . 3  |-  ( ph  ->  A R B )
31, 2ersym 6441 . 2  |-  ( ph  ->  B R A )
41, 3ercl 6440 1  |-  ( ph  ->  B  e.  X )
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 1480   class class class wbr 3929    Er wer 6426
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121  ax-sep 4046  ax-pow 4098  ax-pr 4131
This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-nf 1437  df-sb 1736  df-eu 2002  df-mo 2003  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-ral 2421  df-rex 2422  df-v 2688  df-un 3075  df-in 3077  df-ss 3084  df-pw 3512  df-sn 3533  df-pr 3534  df-op 3536  df-br 3930  df-opab 3990  df-xp 4545  df-rel 4546  df-cnv 4547  df-dm 4549  df-er 6429
This theorem is referenced by:  qliftfun  6511  nqnq0pi  7246
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