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Theorem mapex 7941
Description: The class of all functions mapping one set to another is a set. Remark after Definition 10.24 of [Kunen] p. 31. (Contributed by Raph Levien, 4-Dec-2003.) (Proof shortened by AV, 16-Jun-2025.)
Assertion
Ref Expression
mapex ((𝐴𝐶𝐵𝐷) → {𝑓𝑓:𝐴𝐵} ∈ V)
Distinct variable groups:   𝐴,𝑓   𝐵,𝑓
Allowed substitution hints:   𝐶(𝑓)   𝐷(𝑓)

Proof of Theorem mapex
StepHypRef Expression
1 eqid 2762 . . 3 {𝑓 ∣ (𝑓:𝐴𝐵𝑓:𝐴𝐵)} = {𝑓 ∣ (𝑓:𝐴𝐵𝑓:𝐴𝐵)}
21fabexg 7939 . 2 ((𝐴𝐶𝐵𝐷) → {𝑓 ∣ (𝑓:𝐴𝐵𝑓:𝐴𝐵)} ∈ V)
3 id 23 . . . . 5 (𝑓:𝐴𝐵𝑓:𝐴𝐵)
43ancli 558 . . . 4 (𝑓:𝐴𝐵 → (𝑓:𝐴𝐵𝑓:𝐴𝐵))
54ss2abi 4017 . . 3 {𝑓𝑓:𝐴𝐵} ⊆ {𝑓 ∣ (𝑓:𝐴𝐵𝑓:𝐴𝐵)}
65a1i 11 . 2 ((𝐴𝐶𝐵𝐷) → {𝑓𝑓:𝐴𝐵} ⊆ {𝑓 ∣ (𝑓:𝐴𝐵𝑓:𝐴𝐵)})
72, 6ssexd 5293 1 ((𝐴𝐶𝐵𝐷) → {𝑓𝑓:𝐴𝐵} ∈ V)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wa 401  wcel 2145  {cab 2740  Vcvv 3453  wss 3902  wf 6533
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 2734  ax-sep 5255  ax-pow 5334  ax-pr 5402  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 2741  df-cleq 2754  df-clel 2837  df-ral 3079  df-rex 3089  df-rab 3415  df-v 3455  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-nul 4283  df-if 4486  df-pw 4562  df-sn 4588  df-pr 4590  df-op 4594  df-uni 4871  df-br 5108  df-opab 5172  df-xp 5665  df-rel 5666  df-cnv 5667  df-dm 5669  df-rn 5670  df-fun 6539  df-fn 6540  df-f 6541
This theorem is used by:  fnmap  8836  mapvalg  8839  wksfval  30077  measbase  34716  measval  34717  ismeas  34718  isrnmeas  34719  sticksstones4  43023  sticksstones14  43034  sticksstones20  43040  cnfex  45870  opabresexd  48183  upwlksfval  49059
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