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Theorem elfvov1 7402
Description: Utility theorem: reverse closure for any operation that results in a function. (Contributed by SN, 18-May-2025.)
Hypotheses
Ref Expression
elfvov1.o Rel dom 𝑂
elfvov1.s 𝑆 = (𝐼𝑂𝑅)
elfvov1.x (𝜑𝑋 ∈ (𝑆𝑌))
Assertion
Ref Expression
elfvov1 (𝜑𝐼 ∈ V)

Proof of Theorem elfvov1
StepHypRef Expression
1 elfvov1.x . . 3 (𝜑𝑋 ∈ (𝑆𝑌))
2 n0i 4271 . . 3 (𝑋 ∈ (𝑆𝑌) → ¬ (𝑆𝑌) = ∅)
31, 2syl 17 . 2 (𝜑 → ¬ (𝑆𝑌) = ∅)
4 elfvov1.s . . . . 5 𝑆 = (𝐼𝑂𝑅)
5 elfvov1.o . . . . . 6 Rel dom 𝑂
65ovprc1 7399 . . . . 5 𝐼 ∈ V → (𝐼𝑂𝑅) = ∅)
74, 6eqtrid 2788 . . . 4 𝐼 ∈ V → 𝑆 = ∅)
87fveq1d 6833 . . 3 𝐼 ∈ V → (𝑆𝑌) = (∅‘𝑌))
9 0fv 6872 . . 3 (∅‘𝑌) = ∅
108, 9eqtrdi 2792 . 2 𝐼 ∈ V → (𝑆𝑌) = ∅)
113, 10nsyl2 141 1 (𝜑𝐼 ∈ V)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4   = wceq 1548  wcel 2121  Vcvv 3433  c0 4264  dom cdm 5621  Rel wrel 5626  cfv 6489  (class class class)co 7360
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1975  ax-7 2016  ax-8 2123  ax-9 2131  ax-ext 2713  ax-sep 5221  ax-nul 5231  ax-pr 5365
This theorem depends on definitions:  df-bi 209  df-an 398  df-or 855  df-3an 1095  df-tru 1551  df-fal 1561  df-ex 1788  df-sb 2075  df-mo 2545  df-eu 2575  df-clab 2720  df-cleq 2733  df-clel 2816  df-ne 2937  df-ral 3056  df-rex 3066  df-rab 3394  df-v 3435  df-dif 3888  df-un 3890  df-in 3892  df-ss 3902  df-nul 4265  df-if 4458  df-sn 4559  df-pr 4561  df-op 4565  df-uni 4842  df-br 5076  df-opab 5138  df-xp 5627  df-rel 5628  df-dm 5631  df-iota 6445  df-fv 6497  df-ov 7363
This theorem is referenced by:  ismhp  22132  mhprcl  22135  mhpmulcl  22141  mhppwdeg  22142  mhpaddcl  22143  mhpinvcl  22144  mhpvscacl  22146  mhpind  43059  evlsmhpvvval  43060  mhphf2  43063  mhphf3  43064
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