ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  fabexg GIF version

Theorem fabexg 5405
Description: Existence of a set of functions. (Contributed by Paul Chapman, 25-Feb-2008.)
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 xpexg 4742 . 2 ((𝐴𝐶𝐵𝐷) → (𝐴 × 𝐵) ∈ V)
2 pwexg 4182 . 2 ((𝐴 × 𝐵) ∈ V → 𝒫 (𝐴 × 𝐵) ∈ V)
3 fabexg.1 . . . . 5 𝐹 = {𝑥 ∣ (𝑥:𝐴𝐵𝜑)}
4 fssxp 5385 . . . . . . . 8 (𝑥:𝐴𝐵𝑥 ⊆ (𝐴 × 𝐵))
5 velpw 3584 . . . . . . . 8 (𝑥 ∈ 𝒫 (𝐴 × 𝐵) ↔ 𝑥 ⊆ (𝐴 × 𝐵))
64, 5sylibr 134 . . . . . . 7 (𝑥:𝐴𝐵𝑥 ∈ 𝒫 (𝐴 × 𝐵))
76anim1i 340 . . . . . 6 ((𝑥:𝐴𝐵𝜑) → (𝑥 ∈ 𝒫 (𝐴 × 𝐵) ∧ 𝜑))
87ss2abi 3229 . . . . 5 {𝑥 ∣ (𝑥:𝐴𝐵𝜑)} ⊆ {𝑥 ∣ (𝑥 ∈ 𝒫 (𝐴 × 𝐵) ∧ 𝜑)}
93, 8eqsstri 3189 . . . 4 𝐹 ⊆ {𝑥 ∣ (𝑥 ∈ 𝒫 (𝐴 × 𝐵) ∧ 𝜑)}
10 ssab2 3241 . . . 4 {𝑥 ∣ (𝑥 ∈ 𝒫 (𝐴 × 𝐵) ∧ 𝜑)} ⊆ 𝒫 (𝐴 × 𝐵)
119, 10sstri 3166 . . 3 𝐹 ⊆ 𝒫 (𝐴 × 𝐵)
12 ssexg 4144 . . 3 ((𝐹 ⊆ 𝒫 (𝐴 × 𝐵) ∧ 𝒫 (𝐴 × 𝐵) ∈ V) → 𝐹 ∈ V)
1311, 12mpan 424 . 2 (𝒫 (𝐴 × 𝐵) ∈ V → 𝐹 ∈ V)
141, 2, 133syl 17 1 ((𝐴𝐶𝐵𝐷) → 𝐹 ∈ V)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104   = wceq 1353  wcel 2148  {cab 2163  Vcvv 2739  wss 3131  𝒫 cpw 3577   × cxp 4626  wf 5214
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-sep 4123  ax-pow 4176  ax-pr 4211  ax-un 4435
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ral 2460  df-rex 2461  df-v 2741  df-un 3135  df-in 3137  df-ss 3144  df-pw 3579  df-sn 3600  df-pr 3601  df-op 3603  df-uni 3812  df-br 4006  df-opab 4067  df-xp 4634  df-rel 4635  df-cnv 4636  df-dm 4638  df-rn 4639  df-fun 5220  df-fn 5221  df-f 5222
This theorem is referenced by:  fabex  5406  f1oabexg  5475
  Copyright terms: Public domain W3C validator