MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  fabexg Structured version   Visualization version   GIF version

Theorem fabexg 7944
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 3479 . 2 (𝐴𝐶𝐴 ∈ V)
2 elex 3479 . 2 (𝐵𝐷𝐵 ∈ V)
3 fabexg.1 . . 3 𝐹 = {𝑥 ∣ (𝑥:𝐴𝐵𝜑)}
4 simprl 783 . . . 4 (((𝐴 ∈ V ∧ 𝐵 ∈ V) ∧ (𝑥:𝐴𝐵𝜑)) → 𝑥:𝐴𝐵)
5 simpl 488 . . . 4 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → 𝐴 ∈ V)
6 simpr 490 . . . 4 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → 𝐵 ∈ V)
74, 5, 6fabexd 7943 . . 3 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → {𝑥 ∣ (𝑥:𝐴𝐵𝜑)} ∈ V)
83, 7eqeltrid 2870 . 2 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → 𝐹 ∈ V)
91, 2, 8syl2an 608 1 ((𝐴𝐶𝐵𝐷) → 𝐹 ∈ V)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wa 401   = wceq 1570  wcel 2146  {cab 2744  Vcvv 3458  wf 6539
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 2148  ax-9 2156  ax-ext 2738  ax-sep 5262  ax-pow 5341  ax-pr 5409  ax-un 7745
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 2745  df-cleq 2758  df-clel 2841  df-ral 3083  df-rex 3093  df-rab 3420  df-v 3460  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-nul 4290  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4878  df-br 5115  df-opab 5179  df-xp 5672  df-rel 5673  df-cnv 5674  df-dm 5676  df-rn 5677  df-fun 6545  df-fn 6546  df-f 6547
This theorem is used by:  fabex  7945  mapex  7946  elghomlem1OLD  38577
  Copyright terms: Public domain W3C validator