Theorem setsdm 16509

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 5321	. . . . 5 ⊢ ⟨𝐼, 𝐸⟩ ∈ V
2	1	a1i 11	. . . 4 ⊢ (𝐸 ∈ 𝑊 → ⟨𝐼, 𝐸⟩ ∈ V)
3		setsvalg 16504	. . . 4 ⊢ ((𝐺 ∈ 𝑉 ∧ ⟨𝐼, 𝐸⟩ ∈ V) → (𝐺 sSet ⟨𝐼, 𝐸⟩) = ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}))
4	2, 3	sylan2 595	. . 3 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → (𝐺 sSet ⟨𝐼, 𝐸⟩) = ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}))
5	4	dmeqd 5738	. 2 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom (𝐺 sSet ⟨𝐼, 𝐸⟩) = dom ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}))
6		dmun 5743	. . 3 ⊢ dom ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}) = (dom (𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ dom {⟨𝐼, 𝐸⟩})
7		dmres 5840	. . . . 5 ⊢ dom (𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) = ((V ∖ dom {⟨𝐼, 𝐸⟩}) ∩ dom 𝐺)
8		dmsnopg 6037	. . . . . . . . 9 ⊢ (𝐸 ∈ 𝑊 → dom {⟨𝐼, 𝐸⟩} = {𝐼})
9	8	adantl 485	. . . . . . . 8 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom {⟨𝐼, 𝐸⟩} = {𝐼})
10	9	difeq2d 4050	. . . . . . 7 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → (V ∖ dom {⟨𝐼, 𝐸⟩}) = (V ∖ {𝐼}))
11	10	ineq1d 4138	. . . . . 6 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → ((V ∖ dom {⟨𝐼, 𝐸⟩}) ∩ dom 𝐺) = ((V ∖ {𝐼}) ∩ dom 𝐺))
12		incom 4128	. . . . . . 7 ⊢ ((V ∖ {𝐼}) ∩ dom 𝐺) = (dom 𝐺 ∩ (V ∖ {𝐼}))
13		invdif 4195	. . . . . . 7 ⊢ (dom 𝐺 ∩ (V ∖ {𝐼})) = (dom 𝐺 ∖ {𝐼})
14	12, 13	eqtri 2821	. . . . . 6 ⊢ ((V ∖ {𝐼}) ∩ dom 𝐺) = (dom 𝐺 ∖ {𝐼})
15	11, 14	eqtrdi 2849	. . . . 5 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → ((V ∖ dom {⟨𝐼, 𝐸⟩}) ∩ dom 𝐺) = (dom 𝐺 ∖ {𝐼}))
16	7, 15	syl5eq 2845	. . . 4 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom (𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) = (dom 𝐺 ∖ {𝐼}))
17	16, 9	uneq12d 4091	. . 3 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → (dom (𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ dom {⟨𝐼, 𝐸⟩}) = ((dom 𝐺 ∖ {𝐼}) ∪ {𝐼}))
18	6, 17	syl5eq 2845	. 2 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}) = ((dom 𝐺 ∖ {𝐼}) ∪ {𝐼}))
19		undif1 4382	. . 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 2837	1 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom (𝐺 sSet ⟨𝐼, 𝐸⟩) = (dom 𝐺 ∪ {𝐼}))

Syntax hints:   → wi 4   ∧ wa 399   = wceq 1538   ∈ wcel 2111  Vcvv 3441   ∖ cdif 3878   ∪ cun 3879   ∩ cin 3880  {csn 4525  ⟨cop 4531  dom cdm 5519   ↾ cres 5521  (class class class)co 7135   sSet csts 16473

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770  ax-sep 5167  ax-nul 5174  ax-pr 5295  ax-un 7441

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2598  df-eu 2629  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-ral 3111  df-rex 3112  df-rab 3115  df-v 3443  df-sbc 3721  df-dif 3884  df-un 3886  df-in 3888  df-ss 3898  df-nul 4244  df-if 4426  df-sn 4526  df-pr 4528  df-op 4532  df-uni 4801  df-br 5031  df-opab 5093  df-id 5425  df-xp 5525  df-rel 5526  df-cnv 5527  df-co 5528  df-dm 5529  df-res 5531  df-iota 6283  df-fun 6326  df-fv 6332  df-ov 7138  df-oprab 7139  df-mpo 7140  df-sets 16482

This theorem is referenced by:  setsstruct2  16513  basprssdmsets  16541