Theorem setsdm 17197

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 5428	. . . . 5 ⊢ ⟨𝐼, 𝐸⟩ ∈ V
2	1	a1i 11	. . . 4 ⊢ (𝐸 ∈ 𝑊 → ⟨𝐼, 𝐸⟩ ∈ V)
3		setsvalg 17193	. . . 4 ⊢ ((𝐺 ∈ 𝑉 ∧ ⟨𝐼, 𝐸⟩ ∈ V) → (𝐺 sSet ⟨𝐼, 𝐸⟩) = ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}))
4	2, 3	sylan2 602	. . 3 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → (𝐺 sSet ⟨𝐼, 𝐸⟩) = ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}))
5	4	dmeqd 5877	. 2 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom (𝐺 sSet ⟨𝐼, 𝐸⟩) = dom ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}))
6		dmun 5882	. . 3 ⊢ dom ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}) = (dom (𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ dom {⟨𝐼, 𝐸⟩})
7		dmres 5994	. . . . 5 ⊢ dom (𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) = ((V ∖ dom {⟨𝐼, 𝐸⟩}) ∩ dom 𝐺)
8		dmsnopg 6195	. . . . . . . . 9 ⊢ (𝐸 ∈ 𝑊 → dom {⟨𝐼, 𝐸⟩} = {𝐼})
9	8	adantl 485	. . . . . . . 8 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom {⟨𝐼, 𝐸⟩} = {𝐼})
10	9	difeq2d 4078	. . . . . . 7 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → (V ∖ dom {⟨𝐼, 𝐸⟩}) = (V ∖ {𝐼}))
11	10	ineq1d 4169	. . . . . 6 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → ((V ∖ dom {⟨𝐼, 𝐸⟩}) ∩ dom 𝐺) = ((V ∖ {𝐼}) ∩ dom 𝐺))
12		incom 4159	. . . . . . 7 ⊢ ((V ∖ {𝐼}) ∩ dom 𝐺) = (dom 𝐺 ∩ (V ∖ {𝐼}))
13		invdif 4229	. . . . . . 7 ⊢ (dom 𝐺 ∩ (V ∖ {𝐼})) = (dom 𝐺 ∖ {𝐼})
14	12, 13	eqtri 2784	. . . . . 6 ⊢ ((V ∖ {𝐼}) ∩ dom 𝐺) = (dom 𝐺 ∖ {𝐼})
15	11, 14	eqtrdi 2812	. . . . 5 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → ((V ∖ dom {⟨𝐼, 𝐸⟩}) ∩ dom 𝐺) = (dom 𝐺 ∖ {𝐼}))
16	7, 15	eqtrid 2808	. . . 4 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom (𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) = (dom 𝐺 ∖ {𝐼}))
17	16, 9	uneq12d 4120	. . 3 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → (dom (𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ dom {⟨𝐼, 𝐸⟩}) = ((dom 𝐺 ∖ {𝐼}) ∪ {𝐼}))
18	6, 17	eqtrid 2808	. 2 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom ((𝐺 ↾ (V ∖ dom {⟨𝐼, 𝐸⟩})) ∪ {⟨𝐼, 𝐸⟩}) = ((dom 𝐺 ∖ {𝐼}) ∪ {𝐼}))
19		undif1 4427	. . 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 2800	1 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom (𝐺 sSet ⟨𝐼, 𝐸⟩) = (dom 𝐺 ∪ {𝐼}))

Syntax hints:   → wi 4   ∧ wa 399   = wceq 1559   ∈ wcel 2141  Vcvv 3453   ∖ cdif 3899   ∪ cun 3900   ∩ cin 3901  {csn 4579  ⟨cop 4585  dom cdm 5643   ↾ cres 5645  (class class class)co 7391   sSet csts 17190

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733  ax-sep 5243  ax-pr 5387  ax-un 7713

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1099  df-tru 1562  df-fal 1572  df-ex 1799  df-nf 1803  df-sb 2090  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ral 3076  df-rex 3086  df-rab 3414  df-v 3455  df-sbc 3743  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-nul 4284  df-if 4478  df-sn 4580  df-pr 4582  df-op 4586  df-uni 4863  df-br 5098  df-opab 5160  df-id 5538  df-xp 5649  df-rel 5650  df-cnv 5651  df-co 5652  df-dm 5653  df-res 5655  df-iota 6472  df-fun 6518  df-fv 6524  df-ov 7394  df-oprab 7395  df-mpo 7396  df-sets 17191

This theorem is referenced by:  setsstruct2  17201  basprssdmsets  17248