Theorem ovmpt3rabdm 7684

Description: If the value of a function which is the result of an operation defined by the maps-to notation is not empty, the operands and the argument of the function must be sets. (Contributed by AV, 16-May-2019.)

Hypotheses

Ref	Expression
ovmpt3rab1.o	⊢ 𝑂 = (𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑧 ∈ 𝑀 ↦ {𝑎 ∈ 𝑁 ∣ 𝜑}))
ovmpt3rab1.m	⊢ ((𝑥 = 𝑋 ∧ 𝑦 = 𝑌) → 𝑀 = 𝐾)
ovmpt3rab1.n	⊢ ((𝑥 = 𝑋 ∧ 𝑦 = 𝑌) → 𝑁 = 𝐿)

Assertion

Ref	Expression
ovmpt3rabdm	⊢ (((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑊 ∧ 𝐾 ∈ 𝑈) ∧ 𝐿 ∈ 𝑇) → dom (𝑋𝑂𝑌) = 𝐾)

Distinct variable groups:   𝑥,𝐾,𝑦,𝑧   𝐿,𝑎,𝑥,𝑦   𝑁,𝑎   𝑥,𝑉,𝑦   𝑥,𝑊,𝑦   𝑥,𝑈,𝑦   𝑋,𝑎,𝑥,𝑦,𝑧   𝑌,𝑎,𝑥,𝑦,𝑧   𝑧,𝐿   𝑧,𝑇   𝑧,𝑈   𝑧,𝑉   𝑧,𝑊

Allowed substitution hints:   𝜑(𝑥, 𝑦, 𝑧, 𝑎)   𝑇(𝑥, 𝑦, 𝑎)   𝑈(𝑎)   𝐾(𝑎)   𝑀(𝑥, 𝑦, 𝑧, 𝑎)   𝑁(𝑥, 𝑦, 𝑧)   𝑂(𝑥, 𝑦, 𝑧, 𝑎)   𝑉(𝑎)   𝑊(𝑎)

Proof of Theorem ovmpt3rabdm

Step	Hyp	Ref	Expression
1		ovmpt3rab1.o	. . . . 5 ⊢ 𝑂 = (𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑧 ∈ 𝑀 ↦ {𝑎 ∈ 𝑁 ∣ 𝜑}))
2		ovmpt3rab1.m	. . . . 5 ⊢ ((𝑥 = 𝑋 ∧ 𝑦 = 𝑌) → 𝑀 = 𝐾)
3		ovmpt3rab1.n	. . . . 5 ⊢ ((𝑥 = 𝑋 ∧ 𝑦 = 𝑌) → 𝑁 = 𝐿)
4		sbceq1a 3749	. . . . . 6 ⊢ (𝑦 = 𝑌 → (𝜑 ↔ [𝑌 / 𝑦]𝜑))
5		sbceq1a 3749	. . . . . 6 ⊢ (𝑥 = 𝑋 → ([𝑌 / 𝑦]𝜑 ↔ [𝑋 / 𝑥][𝑌 / 𝑦]𝜑))
6	4, 5	sylan9bbr 520	. . . . 5 ⊢ ((𝑥 = 𝑋 ∧ 𝑦 = 𝑌) → (𝜑 ↔ [𝑋 / 𝑥][𝑌 / 𝑦]𝜑))
7		nfsbc1v 3758	. . . . 5 ⊢ Ⅎ𝑥[𝑋 / 𝑥][𝑌 / 𝑦]𝜑
8		nfcv 2922	. . . . . 6 ⊢ Ⅎ𝑦𝑋
9		nfsbc1v 3758	. . . . . 6 ⊢ Ⅎ𝑦[𝑌 / 𝑦]𝜑
10	8, 9	nfsbcw 3760	. . . . 5 ⊢ Ⅎ𝑦[𝑋 / 𝑥][𝑌 / 𝑦]𝜑
11	1, 2, 3, 6, 7, 10	ovmpt3rab1 7683	. . . 4 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑊 ∧ 𝐾 ∈ 𝑈) → (𝑋𝑂𝑌) = (𝑧 ∈ 𝐾 ↦ {𝑎 ∈ 𝐿 ∣ [𝑋 / 𝑥][𝑌 / 𝑦]𝜑}))
12	11	adantr 486	. . 3 ⊢ (((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑊 ∧ 𝐾 ∈ 𝑈) ∧ 𝐿 ∈ 𝑇) → (𝑋𝑂𝑌) = (𝑧 ∈ 𝐾 ↦ {𝑎 ∈ 𝐿 ∣ [𝑋 / 𝑥][𝑌 / 𝑦]𝜑}))
13	12	dmeqd 5888	. 2 ⊢ (((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑊 ∧ 𝐾 ∈ 𝑈) ∧ 𝐿 ∈ 𝑇) → dom (𝑋𝑂𝑌) = dom (𝑧 ∈ 𝐾 ↦ {𝑎 ∈ 𝐿 ∣ [𝑋 / 𝑥][𝑌 / 𝑦]𝜑}))
14		rabexg 5299	. . . . 5 ⊢ (𝐿 ∈ 𝑇 → {𝑎 ∈ 𝐿 ∣ [𝑋 / 𝑥][𝑌 / 𝑦]𝜑} ∈ V)
15	14	adantl 487	. . . 4 ⊢ (((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑊 ∧ 𝐾 ∈ 𝑈) ∧ 𝐿 ∈ 𝑇) → {𝑎 ∈ 𝐿 ∣ [𝑋 / 𝑥][𝑌 / 𝑦]𝜑} ∈ V)
16	15	ralrimivw 3158	. . 3 ⊢ (((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑊 ∧ 𝐾 ∈ 𝑈) ∧ 𝐿 ∈ 𝑇) → ∀𝑧 ∈ 𝐾 {𝑎 ∈ 𝐿 ∣ [𝑋 / 𝑥][𝑌 / 𝑦]𝜑} ∈ V)
17		dmmptg 6246	. . 3 ⊢ (∀𝑧 ∈ 𝐾 {𝑎 ∈ 𝐿 ∣ [𝑋 / 𝑥][𝑌 / 𝑦]𝜑} ∈ V → dom (𝑧 ∈ 𝐾 ↦ {𝑎 ∈ 𝐿 ∣ [𝑋 / 𝑥][𝑌 / 𝑦]𝜑}) = 𝐾)
18	16, 17	syl 18	. 2 ⊢ (((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑊 ∧ 𝐾 ∈ 𝑈) ∧ 𝐿 ∈ 𝑇) → dom (𝑧 ∈ 𝐾 ↦ {𝑎 ∈ 𝐿 ∣ [𝑋 / 𝑥][𝑌 / 𝑦]𝜑}) = 𝐾)
19	13, 18	eqtrd 2795	1 ⊢ (((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑊 ∧ 𝐾 ∈ 𝑈) ∧ 𝐿 ∈ 𝑇) → dom (𝑋𝑂𝑌) = 𝐾)

This proof depends on syntax axioms:   → wi 4   ∧ wa 401   ∧ w3a 1103   = wceq 1569   ∈ wcel 2144  ∀wral 3076  {crab 3412  Vcvv 3450  [wsbc 3738   ↦ cmpt 5185  dom cdm 5651  (class class class)co 7424   ∈ cmpo 7426

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-rep 5231  ax-sep 5248  ax-nul 5259  ax-pr 5391

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-reu 3366  df-rab 3413  df-v 3452  df-sbc 3739  df-csb 3848  df-ss 3897  df-dif 4046  df-in 4090  df-un 4150  df-nul 4278  df-if 4482  df-pw 4558  df-sn 4585  df-pr 4587  df-op 4835  df-uni 4867  df-iun 4952  df-br 5103  df-opab 5167  df-mpt 5186  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-iota 6497  df-fun 6545  df-fn 6546  df-f 6547  df-f1 6548  df-fo 6549  df-f1o 6550  df-fv 6551  df-ov 7427  df-oprab 7428  df-mpo 7429

This theorem is used by:  elovmpt3rab1  7685