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Theorem encv 6749
Description: If two classes are equinumerous, both classes are sets. (Contributed by AV, 21-Mar-2019.)
Assertion
Ref Expression
encv (𝐴𝐵 → (𝐴 ∈ V ∧ 𝐵 ∈ V))

Proof of Theorem encv
StepHypRef Expression
1 relen 6747 . 2 Rel ≈
2 brrelex12 4666 . 2 ((Rel ≈ ∧ 𝐴𝐵) → (𝐴 ∈ V ∧ 𝐵 ∈ V))
31, 2mpan 424 1 (𝐴𝐵 → (𝐴 ∈ V ∧ 𝐵 ∈ V))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wcel 2148  Vcvv 2739   class class class wbr 4005  Rel wrel 4633  cen 6741
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-14 2151  ax-ext 2159  ax-sep 4123  ax-pow 4176  ax-pr 4211
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1461  df-sb 1763  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ral 2460  df-rex 2461  df-v 2741  df-un 3135  df-in 3137  df-ss 3144  df-pw 3579  df-sn 3600  df-pr 3601  df-op 3603  df-br 4006  df-opab 4067  df-xp 4634  df-rel 4635  df-en 6744
This theorem is referenced by:  bren  6750  en1uniel  6807  cardcl  7183  isnumi  7184  cardval3ex  7187  djuen  7213  ccfunen  7266
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