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Theorem elfvov1 7450
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 (𝜑 → 𝑋 ∈ (𝑆‘𝑌))
Assertion
Ref Expression
elfvov1 (𝜑 → 𝐼 ∈ V)

Proof of Theorem elfvov1
StepHypRef Expression
1 elfvov1.x . . 3 (𝜑 → 𝑋 ∈ (𝑆‘𝑌))
2 n0i 4285 . . 3 (𝑋 ∈ (𝑆‘𝑌) → ¬ (𝑆‘𝑌) = ∅)
31, 2syl 18 . 2 (𝜑 → ¬ (𝑆‘𝑌) = ∅)
4 elfvov1.s . . . . 5 𝑆 = (𝐼𝑂𝑅)
5 elfvov1.o . . . . . 6 Rel dom 𝑂
65ovprc1 7447 . . . . 5 (¬ 𝐼 ∈ V → (𝐼𝑂𝑅) = ∅)
74, 6eqtrid 2807 . . . 4 (¬ 𝐼 ∈ V → 𝑆 = ∅)
87fveq1d 6875 . . 3 (¬ 𝐼 ∈ V → (𝑆‘𝑌) = (∅‘𝑌))
9 0fv 6914 . . 3 (∅‘𝑌) = ∅
108, 9eqtrdi 2811 . 2 (¬ 𝐼 ∈ V → (𝑆‘𝑌) = ∅)
113, 10nsyl2 142 1 (𝜑 → 𝐼 ∈ V)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3   → wi 4   = wceq 1570   ∈ wcel 2145  Vcvv 3450  ∅c0 4278  dom cdm 5647  Rel wrel 5652  ‘cfv 6527  (class class class)co 7408
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2732  ax-sep 5248  ax-nul 5259  ax-pr 5390
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-ne 2956  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-dif 3901  df-un 3903  df-in 3905  df-ss 3915  df-nul 4279  df-if 4482  df-sn 4584  df-pr 4586  df-op 4590  df-uni 4867  df-br 5103  df-opab 5167  df-xp 5653  df-rel 5654  df-dm 5657  df-iota 6483  df-fv 6535  df-ov 7411
This theorem is used by:  ismhp  22422  mhprcl  22425  mhpmulcl  22431  mhppwdeg  22432  mhpaddcl  22433  mhpinvcl  22434  mhpvscacl  22436  mhpind  43544  evlsmhpvvval  43545  mhphf2  43548  mhphf3  43549
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