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Theorem dprddomcld 19122

Description: If a family of subgroups is a family of subgroups for an internal direct product, then it is indexed by a set. (Contributed by AV, 13-Jul-2019.)

**Hypotheses**
Ref	Expression
dprddomcld.1	⊢ (𝜑 → 𝐺dom DProd 𝑆)
dprddomcld.2	⊢ (𝜑 → dom 𝑆 = 𝐼)

**Assertion**
Ref	Expression
dprddomcld	⊢ (𝜑 → 𝐼 ∈ V)

**Proof of Theorem dprddomcld**
Step	Hyp	Ref	Expression
1		dprddomcld.2	. 2 ⊢ (𝜑 → dom 𝑆 = 𝐼)
2		dprddomcld.1	. 2 ⊢ (𝜑 → 𝐺dom DProd 𝑆)
3		df-nel 3124	. . . . 5 ⊢ (dom 𝑆 ∉ V ↔ ¬ dom 𝑆 ∈ V)
4		dprddomprc 19121	. . . . 5 ⊢ (dom 𝑆 ∉ V → ¬ 𝐺dom DProd 𝑆)
5	3, 4	sylbir 237	. . . 4 ⊢ (¬ dom 𝑆 ∈ V → ¬ 𝐺dom DProd 𝑆)
6	5	con4i 114	. . 3 ⊢ (𝐺dom DProd 𝑆 → dom 𝑆 ∈ V)
7		eleq1 2900	. . 3 ⊢ (dom 𝑆 = 𝐼 → (dom 𝑆 ∈ V ↔ 𝐼 ∈ V))
8	6, 7	syl5ib 246	. 2 ⊢ (dom 𝑆 = 𝐼 → (𝐺dom DProd 𝑆 → 𝐼 ∈ V))
9	1, 2, 8	sylc 65	1 ⊢ (𝜑 → 𝐼 ∈ V)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 = wceq 1533 ∈ wcel 2110 ∉ wnel 3123 Vcvv 3494 class class class wbr 5065 dom cdm 5554 DProd cdprd 19114

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5202 ax-nul 5209 ax-pr 5329 ax-un 7460

This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-nel 3124 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-nul 4291 df-if 4467 df-sn 4567 df-pr 4569 df-op 4573 df-uni 4838 df-br 5066 df-opab 5128 df-xp 5560 df-rel 5561 df-cnv 5562 df-dm 5564 df-rn 5565 df-oprab 7159 df-mpo 7160 df-dprd 19116

This theorem is referenced by: dprdcntz 19129 dprddisj 19130 dprdw 19131 dprdwd 19132 dprdfid 19138 dprdfinv 19140 dprdfadd 19141 dprdfsub 19142 dprdfeq0 19143 dprdf11 19144 dprdlub 19147 dprdres 19149 dprdss 19150 dprdf1o 19153 dmdprdsplitlem 19158 dprddisj2 19160 dmdprdsplit2 19167 dpjfval 19176 dpjidcl 19179

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