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Theorem fosetex 8894
Description: The set of surjections between two classes exists (without any precondition). (Contributed by AV, 8-Aug-2024.)
Assertion
Ref Expression
fosetex {𝑓 ∣ 𝑓:𝐴–onto→𝐵} ∈ V
Distinct variable groups:   𝐴,𝑓   𝐵,𝑓

Proof of Theorem fosetex
StepHypRef Expression
1 ovex 7463 . 2 (𝐵 ↑m 𝐴) ∈ V
2 mapfoss 8888 . 2 {𝑓 ∣ 𝑓:𝐴–onto→𝐵} ⊆ (𝐵 ↑m 𝐴)
31, 2ssexi 5288 1 {𝑓 ∣ 𝑓:𝐴–onto→𝐵} ∈ V
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   ∈ wcel 2146  {cab 2741  Vcvv 3454  –onto→wfo 6545  (class class class)co 7430   ↑m cmap 8861
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 1944  ax-6 2001  ax-7 2042  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2196  ax-12 2215  ax-ext 2735  ax-sep 5252  ax-nul 5263  ax-pow 5331  ax-pr 5395  ax-un 7761
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-nf 1816  df-sb 2101  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-sbc 3743  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-br 5107  df-opab 5171  df-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-iota 6501  df-fun 6549  df-fn 6550  df-f 6551  df-fo 6553  df-fv 6555  df-ov 7433  df-oprab 7434  df-mpo 7435  df-map 8863
This theorem is used by:  f1osetex  8895
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