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Theorem nd4 4953
Description: A lemma for proving conditionless ZFC axioms.
Assertion
Ref Expression
nd4 |- (A.x x = y -> -. A.z y e. x)

Proof of Theorem nd4
StepHypRef Expression
1 nd3 4952 . 2 |- (A.y y = x -> -. A.z y e. x)
21alequcoms 1145 1 |- (A.x x = y -> -. A.z y e. x)
Colors of variables: wff set class
Syntax hints:  -. wn 2   -> wi 3  A.wal 956   = wceq 958   e. wcel 960
This theorem is referenced by:  axrepnd 4958
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 964  ax-gen 965  ax-8 966  ax-10 968  ax-11 969  ax-12 970  ax-13 971  ax-14 972  ax-17 973  ax-4 975  ax-5o 977  ax-6o 980  ax-9o 1125  ax-10o 1142  ax-16 1212  ax-11o 1220  ax-ext 1462  ax-sep 2708  ax-pow 2748  ax-reg 4602
This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-ex 983  df-sb 1174  df-eu 1384  df-mo 1385  df-clab 1467  df-cleq 1472  df-clel 1475  df-ne 1590  df-ral 1652  df-rex 1653  df-v 1815  df-dif 2052  df-un 2053  df-in 2054  df-ss 2056  df-nul 2284  df-pw 2406  df-sn 2416  df-pr 2417
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