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Theorem fdmexb 7625
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 6503 . 2 (𝐹:𝐴𝐵𝐹 Fn 𝐴)
2 fndmexb 7624 . 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 209  wcel 2111  Vcvv 3409   Fn wfn 6335  wf 6336
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2729  ax-rep 5160  ax-sep 5173  ax-nul 5180  ax-pr 5302  ax-un 7465
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2557  df-eu 2588  df-clab 2736  df-cleq 2750  df-clel 2830  df-nfc 2901  df-ne 2952  df-ral 3075  df-rex 3076  df-reu 3077  df-rab 3079  df-v 3411  df-sbc 3699  df-csb 3808  df-dif 3863  df-un 3865  df-in 3867  df-ss 3877  df-nul 4228  df-if 4424  df-sn 4526  df-pr 4528  df-op 4532  df-uni 4802  df-iun 4888  df-br 5037  df-opab 5099  df-mpt 5117  df-id 5434  df-xp 5534  df-rel 5535  df-cnv 5536  df-co 5537  df-dm 5538  df-rn 5539  df-res 5540  df-ima 5541  df-iota 6299  df-fun 6342  df-fn 6343  df-f 6344  df-f1 6345  df-fo 6346  df-f1o 6347  df-fv 6348
This theorem is referenced by:  dmfexALT  7626
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