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Theorem elfvov1 7452
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 4292 . . 3 (𝑋 ∈ (𝑆𝑌) → ¬ (𝑆𝑌) = ∅)
31, 2syl 18 . 2 (𝜑 → ¬ (𝑆𝑌) = ∅)
4 elfvov1.s . . . . 5 𝑆 = (𝐼𝑂𝑅)
5 elfvov1.o . . . . . 6 Rel dom 𝑂
65ovprc1 7449 . . . . 5 𝐼 ∈ V → (𝐼𝑂𝑅) = ∅)
74, 6eqtrid 2808 . . . 4 𝐼 ∈ V → 𝑆 = ∅)
87fveq1d 6883 . . 3 𝐼 ∈ V → (𝑆𝑌) = (∅‘𝑌))
9 0fv 6922 . . 3 (∅‘𝑌) = ∅
108, 9eqtrdi 2812 . 2 𝐼 ∈ V → (𝑆𝑌) = ∅)
113, 10nsyl2 142 1 (𝜑𝐼 ∈ V)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4   = wceq 1568  wcel 2141  Vcvv 3453  c0 4285  dom cdm 5661  Rel wrel 5666  cfv 6536  (class class class)co 7410
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1823  ax-4 1837  ax-5 1938  ax-6 1995  ax-7 2036  ax-8 2143  ax-9 2151  ax-ext 2733  ax-sep 5256  ax-nul 5268  ax-pr 5404
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1571  df-fal 1581  df-ex 1808  df-sb 2095  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-ne 2957  df-ral 3078  df-rex 3088  df-rab 3415  df-v 3455  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4487  df-sn 4589  df-pr 4591  df-op 4595  df-uni 4872  df-br 5109  df-opab 5173  df-xp 5667  df-rel 5668  df-dm 5671  df-iota 6492  df-fv 6544  df-ov 7413
This theorem is referenced by:  ismhp  22282  mhprcl  22285  mhpmulcl  22291  mhppwdeg  22292  mhpaddcl  22293  mhpinvcl  22294  mhpvscacl  22296  mhpind  43274  evlsmhpvvval  43275  mhphf2  43278  mhphf3  43279
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