Theorem setsdm 16519

Description: The domain of a structure with replacement is the domain of the original structure extended by the index of the replacement. (Contributed by AV, 7-Jun-2021.)

Assertion

Ref	Expression
setsdm	⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom (𝐺 sSet ⟨𝐼, 𝐸⟩) = (dom 𝐺 ∪ {𝐼}))

Proof of Theorem setsdm

Step	Hyp	Ref	Expression
1		opex 5358	. . . . 5 ⊢ ⟨𝐼, 𝐸⟩ ∈ V
2	1	a1i 11	. . . 4 ⊢ (𝐸 ∈ 𝑊 → ⟨𝐼, 𝐸⟩ ∈ V)
3		setsvalg 16514	. . . 4 ⊢ ((𝐺 ∈ 𝑉 ∧ ⟨𝐼, 𝐸⟩ ∈ V) → (𝐺 sSet ⟨𝐼, 𝐸⟩) = ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}))
4	2, 3	sylan2 594	. . 3 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → (𝐺 sSet ⟨𝐼, 𝐸⟩) = ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}))
5	4	dmeqd 5776	. 2 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom (𝐺 sSet ⟨𝐼, 𝐸⟩) = dom ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}))
6		dmun 5781	. . 3 ⊢ dom ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}) = (dom (𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ dom {⟨𝐼, 𝐸⟩})
7		dmres 5877	. . . . 5 ⊢ dom (𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) = ((V ∖ dom {⟨𝐼, 𝐸⟩}) ∩ dom 𝐺)
8		dmsnopg 6072	. . . . . . . . 9 ⊢ (𝐸 ∈ 𝑊 → dom {⟨𝐼, 𝐸⟩} = {𝐼})
9	8	adantl 484	. . . . . . . 8 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom {⟨𝐼, 𝐸⟩} = {𝐼})
10	9	difeq2d 4101	. . . . . . 7 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → (V ∖ dom {⟨𝐼, 𝐸⟩}) = (V ∖ {𝐼}))
11	10	ineq1d 4190	. . . . . 6 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → ((V ∖ dom {⟨𝐼, 𝐸⟩}) ∩ dom 𝐺) = ((V ∖ {𝐼}) ∩ dom 𝐺))
12		incom 4180	. . . . . . 7 ⊢ ((V ∖ {𝐼}) ∩ dom 𝐺) = (dom 𝐺 ∩ (V ∖ {𝐼}))
13		invdif 4247	. . . . . . 7 ⊢ (dom 𝐺 ∩ (V ∖ {𝐼})) = (dom 𝐺 ∖ {𝐼})
14	12, 13	eqtri 2846	. . . . . 6 ⊢ ((V ∖ {𝐼}) ∩ dom 𝐺) = (dom 𝐺 ∖ {𝐼})
15	11, 14	syl6eq 2874	. . . . 5 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → ((V ∖ dom {⟨𝐼, 𝐸⟩}) ∩ dom 𝐺) = (dom 𝐺 ∖ {𝐼}))
16	7, 15	syl5eq 2870	. . . 4 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom (𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) = (dom 𝐺 ∖ {𝐼}))
17	16, 9	uneq12d 4142	. . 3 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → (dom (𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ dom {⟨𝐼, 𝐸⟩}) = ((dom 𝐺 ∖ {𝐼}) ∪ {𝐼}))
18	6, 17	syl5eq 2870	. 2 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}) = ((dom 𝐺 ∖ {𝐼}) ∪ {𝐼}))
19		undif1 4426	. . 3 ⊢ ((dom 𝐺 ∖ {𝐼}) ∪ {𝐼}) = (dom 𝐺 ∪ {𝐼})
20	19	a1i 11	. 2 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → ((dom 𝐺 ∖ {𝐼}) ∪ {𝐼}) = (dom 𝐺 ∪ {𝐼}))
21	5, 18, 20	3eqtrd 2862	1 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom (𝐺 sSet ⟨𝐼, 𝐸⟩) = (dom 𝐺 ∪ {𝐼}))

Syntax hints:   → wi 4   ∧ wa 398   = wceq 1537   ∈ wcel 2114  Vcvv 3496   ∖ cdif 3935   ∪ cun 3936   ∩ cin 3937  {csn 4569  ⟨cop 4575  dom cdm 5557   ↾ cres 5559  (class class class)co 7158   sSet csts 16483

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 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-sep 5205  ax-nul 5212  ax-pr 5332  ax-un 7463

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ral 3145  df-rex 3146  df-rab 3149  df-v 3498  df-sbc 3775  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-nul 4294  df-if 4470  df-sn 4570  df-pr 4572  df-op 4576  df-uni 4841  df-br 5069  df-opab 5131  df-id 5462  df-xp 5563  df-rel 5564  df-cnv 5565  df-co 5566  df-dm 5567  df-res 5569  df-iota 6316  df-fun 6359  df-fv 6365  df-ov 7161  df-oprab 7162  df-mpo 7163  df-sets 16492

This theorem is referenced by:  setsstruct2  16523  basprssdmsets  16551