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Theorem mapex 7953
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 ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷) → {𝑓 ∣ 𝑓:𝐴⟶𝐵} ∈ V)
Distinct variable groups:   𝐴,𝑓   𝐵,𝑓
Allowed substitution hints:   𝐶(𝑓)   𝐷(𝑓)

Proof of Theorem mapex
StepHypRef Expression
1 eqid 2760 . . 3 {𝑓 ∣ (𝑓:𝐴⟶𝐵 ∧ 𝑓:𝐴⟶𝐵)} = {𝑓 ∣ (𝑓:𝐴⟶𝐵 ∧ 𝑓:𝐴⟶𝐵)}
21fabexg 7951 . 2 ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷) → {𝑓 ∣ (𝑓:𝐴⟶𝐵 ∧ 𝑓:𝐴⟶𝐵)} ∈ V)
3 id 23 . . . . 5 (𝑓:𝐴⟶𝐵 → 𝑓:𝐴⟶𝐵)
43ancli 558 . . . 4 (𝑓:𝐴⟶𝐵 → (𝑓:𝐴⟶𝐵 ∧ 𝑓:𝐴⟶𝐵))
54ss2abi 3991 . . 3 {𝑓 ∣ 𝑓:𝐴⟶𝐵} ⊆ {𝑓 ∣ (𝑓:𝐴⟶𝐵 ∧ 𝑓:𝐴⟶𝐵)}
65a1i 11 . 2 ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷) → {𝑓 ∣ 𝑓:𝐴⟶𝐵} ⊆ {𝑓 ∣ (𝑓:𝐴⟶𝐵 ∧ 𝑓:𝐴⟶𝐵)})
72, 6ssexd 5285 1 ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷) → {𝑓 ∣ 𝑓:𝐴⟶𝐵} ∈ V)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∧ wa 401   ∈ wcel 2144  {cab 2738  Vcvv 3450   ⊆ wss 3895  ⟶wf 6535
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-ext 2732  ax-sep 5248  ax-pow 5326  ax-pr 5390  ax-un 7752
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2099  df-clab 2739  df-cleq 2752  df-clel 2835  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-pw 4558  df-sn 4585  df-pr 4587  df-op 4835  df-uni 4867  df-br 5103  df-opab 5167  df-xp 5656  df-rel 5657  df-cnv 5658  df-dm 5660  df-rn 5661  df-fun 6541  df-fn 6542  df-f 6543
This theorem is used by:  fnmap  8857  mapvalg  8860  wksfval  30196  measbase  34877  measval  34878  ismeas  34879  isrnmeas  34880  sticksstones4  43293  sticksstones14  43304  sticksstones20  43310  cnfex  46139  opabresexd  48451  upwlksfval  49327
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