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Theorem ax6evr 1698
Description: A commuted form of a9ev 1690. The naming reflects how axioms were numbered in the Metamath Proof Explorer as of 2020 (a numbering which we eventually plan to adopt here too, but until this happens everywhere only some theorems will have it). (Contributed by BJ, 7-Dec-2020.)
Assertion
Ref Expression
ax6evr  |-  E. x  y  =  x
Distinct variable group:    x, y

Proof of Theorem ax6evr
StepHypRef Expression
1 a9ev 1690 . 2  |-  E. x  x  =  y
2 equcomi 1697 . 2  |-  ( x  =  y  ->  y  =  x )
31, 2eximii 1595 1  |-  E. x  y  =  x
Colors of variables: wff set class
Syntax hints:   E.wex 1485
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-5 1440  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527
This theorem depends on definitions:  df-bi 116
This theorem is referenced by: (None)
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