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Theorem fdmexb 7893
Description: The domain of a function is a set iff the function is a set. (Contributed by AV, 8-Aug-2024.)
Assertion
Ref Expression
fdmexb (𝐹:𝐴𝐵 → (𝐴 ∈ V ↔ 𝐹 ∈ V))

Proof of Theorem fdmexb
StepHypRef Expression
1 ffn 6707 . 2 (𝐹:𝐴𝐵𝐹 Fn 𝐴)
2 fndmexb 7892 . 2 (𝐹 Fn 𝐴 → (𝐴 ∈ V ↔ 𝐹 ∈ V))
31, 2syl 17 1 (𝐹:𝐴𝐵 → (𝐴 ∈ V ↔ 𝐹 ∈ V))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wcel 2098  Vcvv 3466   Fn wfn 6528  wf 6529
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-10 2129  ax-11 2146  ax-12 2163  ax-ext 2695  ax-rep 5275  ax-sep 5289  ax-nul 5296  ax-pr 5417  ax-un 7718
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-nf 1778  df-sb 2060  df-mo 2526  df-eu 2555  df-clab 2702  df-cleq 2716  df-clel 2802  df-nfc 2877  df-ne 2933  df-ral 3054  df-rex 3063  df-reu 3369  df-rab 3425  df-v 3468  df-sbc 3770  df-csb 3886  df-dif 3943  df-un 3945  df-in 3947  df-ss 3957  df-nul 4315  df-if 4521  df-sn 4621  df-pr 4623  df-op 4627  df-uni 4900  df-iun 4989  df-br 5139  df-opab 5201  df-mpt 5222  df-id 5564  df-xp 5672  df-rel 5673  df-cnv 5674  df-co 5675  df-dm 5676  df-rn 5677  df-res 5678  df-ima 5679  df-iota 6485  df-fun 6535  df-fn 6536  df-f 6537  df-f1 6538  df-fo 6539  df-f1o 6540  df-fv 6541
This theorem is referenced by:  dmfexALT  7894
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