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Theorem zfregfr 3452
Description: The epsilon relation is founded on any class.
Assertion
Ref Expression
zfregfr E Fr A

Proof of Theorem zfregfr
StepHypRef Expression
1 dfepfr 2184 . 2 (E Fr A ↔ ∀x((xA ∧ ¬ x = ∅) → ∃yx (xy) = ∅))
2 visset 1350 . . . 4 xV
32zfreg2 3448 . . 3 x = ∅ → ∃yx (xy) = ∅)
43adantl 305 . 2 ((xA ∧ ¬ x = ∅) → ∃yx (xy) = ∅)
51, 4mpgbir 686 1 E Fr A
Colors of variables: wff set class
Syntax hints:  ¬ wn 1   → wi 2   ∧ wa 196   = wceq 1091  ∃wrex 1202   ∩ cin 1486   ⊆ wss 1487  ∅c0 1707  Ecep 2056   Fr wfr 2061
This theorem is referenced by:  en2lp 3453
This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-13 804  ax-14 805  ax-16 922  ax-17 925  ax-ext 1074  ax-rep 1075  ax-pow 1077  ax-reg 1078
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-ex 679  df-sb 853  df-clab 1093  df-cleq 1097  df-clel 1099  df-ral 1205  df-rex 1206  df-v 1349  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-pw 1799  df-sn 1811  df-pr 1812  df-op 1815  df-br 2063  df-opab 2098  df-eprel 2122  df-fr 2169
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