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Theorem fabexg 7914
Description: Existence of a set of functions. (Contributed by Paul Chapman, 25-Feb-2008.) (Proof shortened by AV, 9-Jun-2025.)
Hypothesis
Ref Expression
fabexg.1 𝐹 = {𝑥 ∣ (𝑥:𝐴𝐵𝜑)}
Assertion
Ref Expression
fabexg ((𝐴𝐶𝐵𝐷) → 𝐹 ∈ V)
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵
Allowed substitution hints:   𝜑(𝑥)   𝐶(𝑥)   𝐷(𝑥)   𝐹(𝑥)

Proof of Theorem fabexg
StepHypRef Expression
1 elex 3468 . 2 (𝐴𝐶𝐴 ∈ V)
2 elex 3468 . 2 (𝐵𝐷𝐵 ∈ V)
3 fabexg.1 . . 3 𝐹 = {𝑥 ∣ (𝑥:𝐴𝐵𝜑)}
4 simprl 770 . . . 4 (((𝐴 ∈ V ∧ 𝐵 ∈ V) ∧ (𝑥:𝐴𝐵𝜑)) → 𝑥:𝐴𝐵)
5 simpl 482 . . . 4 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → 𝐴 ∈ V)
6 simpr 484 . . . 4 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → 𝐵 ∈ V)
74, 5, 6fabexd 7913 . . 3 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → {𝑥 ∣ (𝑥:𝐴𝐵𝜑)} ∈ V)
83, 7eqeltrid 2832 . 2 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → 𝐹 ∈ V)
91, 2, 8syl2an 596 1 ((𝐴𝐶𝐵𝐷) → 𝐹 ∈ V)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1540  wcel 2109  {cab 2707  Vcvv 3447  wf 6507
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-ext 2701  ax-sep 5251  ax-nul 5261  ax-pow 5320  ax-pr 5387  ax-un 7711
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-sb 2066  df-clab 2708  df-cleq 2721  df-clel 2803  df-ral 3045  df-rex 3054  df-rab 3406  df-v 3449  df-dif 3917  df-un 3919  df-in 3921  df-ss 3931  df-nul 4297  df-if 4489  df-pw 4565  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4872  df-br 5108  df-opab 5170  df-xp 5644  df-rel 5645  df-cnv 5646  df-dm 5648  df-rn 5649  df-fun 6513  df-fn 6514  df-f 6515
This theorem is referenced by:  fabex  7916  mapex  7917  f1oabexgOLD  7919  elghomlem1OLD  37879
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