Theorem elfvov1 7383

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

Step	Hyp	Ref	Expression
1		elfvov1.x	. . 3 ⊢ (𝜑 → 𝑋 ∈ (𝑆‘𝑌))
2		n0i 4288	. . 3 ⊢ (𝑋 ∈ (𝑆‘𝑌) → ¬ (𝑆‘𝑌) = ∅)
3	1, 2	syl 17	. 2 ⊢ (𝜑 → ¬ (𝑆‘𝑌) = ∅)
4		elfvov1.s	. . . . 5 ⊢ 𝑆 = (𝐼𝑂𝑅)
5		elfvov1.o	. . . . . 6 ⊢ Rel dom 𝑂
6	5	ovprc1 7380	. . . . 5 ⊢ (¬ 𝐼 ∈ V → (𝐼𝑂𝑅) = ∅)
7	4, 6	eqtrid 2777	. . . 4 ⊢ (¬ 𝐼 ∈ V → 𝑆 = ∅)
8	7	fveq1d 6819	. . 3 ⊢ (¬ 𝐼 ∈ V → (𝑆‘𝑌) = (∅‘𝑌))
9		0fv 6858	. . 3 ⊢ (∅‘𝑌) = ∅
10	8, 9	eqtrdi 2781	. 2 ⊢ (¬ 𝐼 ∈ V → (𝑆‘𝑌) = ∅)
11	3, 10	nsyl2 141	1 ⊢ (𝜑 → 𝐼 ∈ V)

Syntax hints:  ¬ wn 3   → wi 4   = wceq 1541   ∈ wcel 2110  Vcvv 3434  ∅c0 4281  dom cdm 5614  Rel wrel 5619  ‘cfv 6477  (class class class)co 7341

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2112  ax-9 2120  ax-10 2143  ax-11 2159  ax-12 2179  ax-ext 2702  ax-sep 5232  ax-nul 5242  ax-pr 5368

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2067  df-mo 2534  df-eu 2563  df-clab 2709  df-cleq 2722  df-clel 2804  df-ral 3046  df-rex 3055  df-rab 3394  df-v 3436  df-dif 3903  df-un 3905  df-ss 3917  df-nul 4282  df-if 4474  df-sn 4575  df-pr 4577  df-op 4581  df-uni 4858  df-br 5090  df-opab 5152  df-xp 5620  df-rel 5621  df-dm 5624  df-iota 6433  df-fv 6485  df-ov 7344

This theorem is referenced by:  ismhp  22048  mhprcl  22051  mhpmulcl  22057  mhppwdeg  22058  mhpaddcl  22059  mhpinvcl  22060  mhpvscacl  22062  mhpind  42606  evlsmhpvvval  42607  mhphf2  42610  mhphf3  42611