Theorem setsdm 17392

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 5439	. . . . 5 ⊢ ⟨𝐼, 𝐸⟩ ∈ V
2	1	a1i 11	. . . 4 ⊢ (𝐸 ∈ 𝑊 → ⟨𝐼, 𝐸⟩ ∈ V)
3		setsvalg 17388	. . . 4 ⊢ ((𝐺 ∈ 𝑉 ∧ ⟨𝐼, 𝐸⟩ ∈ V) → (𝐺 sSet ⟨𝐼, 𝐸⟩) = ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}))
4	2, 3	sylan2 605	. . 3 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → (𝐺 sSet ⟨𝐼, 𝐸⟩) = ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}))
5	4	dmeqd 5899	. 2 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom (𝐺 sSet ⟨𝐼, 𝐸⟩) = dom ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}))
6		dmun 5904	. . 3 ⊢ dom ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}) = (dom (𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ dom {⟨𝐼, 𝐸⟩})
7		dmres 6020	. . . . 5 ⊢ dom (𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) = ((V ∖ dom {⟨𝐼, 𝐸⟩}) ∩ dom 𝐺)
8		dmsnopg 6233	. . . . . . . . 9 ⊢ (𝐸 ∈ 𝑊 → dom {⟨𝐼, 𝐸⟩} = {𝐼})
9	8	adantl 487	. . . . . . . 8 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom {⟨𝐼, 𝐸⟩} = {𝐼})
10	9	difeq2d 4066	. . . . . . 7 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → (V ∖ dom {⟨𝐼, 𝐸⟩}) = (V ∖ {𝐼}))
11	10	ineq1d 4119	. . . . . 6 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → ((V ∖ dom {⟨𝐼, 𝐸⟩}) ∩ dom 𝐺) = ((V ∖ {𝐼}) ∩ dom 𝐺))
12		incom 4109	. . . . . . 7 ⊢ ((V ∖ {𝐼}) ∩ dom 𝐺) = (dom 𝐺 ∩ (V ∖ {𝐼}))
13		invdif 4227	. . . . . . 7 ⊢ (dom 𝐺 ∩ (V ∖ {𝐼})) = (dom 𝐺 ∖ {𝐼})
14	12, 13	eqtri 2786	. . . . . 6 ⊢ ((V ∖ {𝐼}) ∩ dom 𝐺) = (dom 𝐺 ∖ {𝐼})
15	11, 14	eqtrdi 2814	. . . . 5 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → ((V ∖ dom {⟨𝐼, 𝐸⟩}) ∩ dom 𝐺) = (dom 𝐺 ∖ {𝐼}))
16	7, 15	eqtrid 2810	. . . 4 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom (𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) = (dom 𝐺 ∖ {𝐼}))
17	16, 9	uneq12d 4171	. . 3 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → (dom (𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ dom {⟨𝐼, 𝐸⟩}) = ((dom 𝐺 ∖ {𝐼}) ∪ {𝐼}))
18	6, 17	eqtrid 2810	. 2 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}) = ((dom 𝐺 ∖ {𝐼}) ∪ {𝐼}))
19		undif1 4433	. . 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 2802	1 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom (𝐺 sSet ⟨𝐼, 𝐸⟩) = (dom 𝐺 ∪ {𝐼}))

This proof depends on syntax axioms:   → wi 4   ∧ wa 401   = wceq 1570   ∈ wcel 2147  Vcvv 3454   ∖ cdif 4048   ∩ cin 4092   ∪ cun 4152  {csn 4588  ⟨cop 4840  dom cdm 5658   ↾ cres 5660  (class class class)co 7451   sSet csts 17385

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 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-sep 5255  ax-pr 5398  ax-un 7783

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-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-sbc 3743  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4841  df-uni 4873  df-br 5109  df-opab 5174  df-id 5553  df-xp 5664  df-rel 5665  df-cnv 5666  df-co 5667  df-dm 5668  df-res 5670  df-iota 6520  df-fun 6568  df-fv 6574  df-ov 7454  df-oprab 7455  df-mpo 7456  df-sets 17386

This theorem is used by:  setsstruct2  17396  basprssdmsets  17443