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Theorem mof02 45743
Description: A variant of mof0 45742. (Contributed by Zhi Wang, 20-Sep-2024.)
Assertion
Ref Expression
mof02 (𝐵 = ∅ → ∃*𝑓 𝑓:𝐴𝐵)
Distinct variable group:   𝐵,𝑓
Allowed substitution hint:   𝐴(𝑓)

Proof of Theorem mof02
StepHypRef Expression
1 mof0 45742 . 2 ∃*𝑓 𝑓:𝐴⟶∅
2 feq3 6497 . . 3 (𝐵 = ∅ → (𝑓:𝐴𝐵𝑓:𝐴⟶∅))
32mobidv 2550 . 2 (𝐵 = ∅ → (∃*𝑓 𝑓:𝐴𝐵 ↔ ∃*𝑓 𝑓:𝐴⟶∅))
41, 3mpbiri 261 1 (𝐵 = ∅ → ∃*𝑓 𝑓:𝐴𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1542  ∃*wmo 2539  c0 4221  wf 6345
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1975  ax-7 2020  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2162  ax-12 2179  ax-ext 2711  ax-sep 5177  ax-nul 5184  ax-pr 5306
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 847  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1787  df-nf 1791  df-sb 2075  df-mo 2541  df-eu 2571  df-clab 2718  df-cleq 2731  df-clel 2812  df-nfc 2882  df-ral 3059  df-rex 3060  df-v 3402  df-dif 3856  df-un 3858  df-in 3860  df-ss 3870  df-nul 4222  df-if 4425  df-sn 4527  df-pr 4529  df-op 4533  df-br 5041  df-opab 5103  df-id 5439  df-xp 5541  df-rel 5542  df-cnv 5543  df-co 5544  df-dm 5545  df-rn 5546  df-fun 6351  df-fn 6352  df-f 6353
This theorem is referenced by:  mofsn2  45749  mofsssn  45750  mofmo  45751
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