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Theorem fabexg 7939
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:𝐴⟶𝐵 ∧ 𝜑)}
Assertion
Ref Expression
fabexg ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷) → 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 3472 . 2 (𝐴 ∈ 𝐶 → 𝐴 ∈ V)
2 elex 3472 . 2 (𝐵 ∈ 𝐷 → 𝐵 ∈ V)
3 fabexg.1 . . 3 𝐹 = {𝑥 ∣ (𝑥:𝐴⟶𝐵 ∧ 𝜑)}
4 simprl 783 . . . 4 (((𝐴 ∈ V ∧ 𝐵 ∈ V) ∧ (𝑥:𝐴⟶𝐵 ∧ 𝜑)) → 𝑥:𝐴⟶𝐵)
5 simpl 488 . . . 4 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → 𝐴 ∈ V)
6 simpr 490 . . . 4 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → 𝐵 ∈ V)
74, 5, 6fabexd 7938 . . 3 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → {𝑥 ∣ (𝑥:𝐴⟶𝐵 ∧ 𝜑)} ∈ V)
83, 7eqeltrid 2865 . 2 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → 𝐹 ∈ V)
91, 2, 8syl2an 608 1 ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷) → 𝐹 ∈ V)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∧ wa 401   = wceq 1570   ∈ wcel 2145  {cab 2739  Vcvv 3451  ⟶wf 6527
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2733  ax-sep 5249  ax-pow 5327  ax-pr 5391  ax-un 7740
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2740  df-cleq 2753  df-clel 2836  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-opab 5168  df-xp 5657  df-rel 5658  df-cnv 5659  df-dm 5661  df-rn 5662  df-fun 6533  df-fn 6534  df-f 6535
This theorem is used by:  fabex  7940  mapex  7941  elghomlem1OLD  38787
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