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Theorem dprddomcld 20073
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 (𝜑𝐺dom DProd 𝑆)
dprddomcld.2 (𝜑 → dom 𝑆 = 𝐼)
Assertion
Ref Expression
dprddomcld (𝜑𝐼 ∈ V)

Proof of Theorem dprddomcld
StepHypRef Expression
1 dprddomcld.2 . 2 (𝜑 → dom 𝑆 = 𝐼)
2 dprddomcld.1 . 2 (𝜑𝐺dom DProd 𝑆)
3 df-nel 3071 . . . . 5 (dom 𝑆 ∉ V ↔ ¬ dom 𝑆 ∈ V)
4 dprddomprc 20072 . . . . 5 (dom 𝑆 ∉ V → ¬ 𝐺dom DProd 𝑆)
53, 4sylbir 238 . . . 4 (¬ dom 𝑆 ∈ V → ¬ 𝐺dom DProd 𝑆)
65con4i 115 . . 3 (𝐺dom DProd 𝑆 → dom 𝑆 ∈ V)
7 eleq1 2857 . . 3 (dom 𝑆 = 𝐼 → (dom 𝑆 ∈ V ↔ 𝐼 ∈ V))
86, 7imbitrid 247 . 2 (dom 𝑆 = 𝐼 → (𝐺dom DProd 𝑆𝐼 ∈ V))
91, 2, 8sylc 66 1 (𝜑𝐼 ∈ V)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4   = wceq 1567  wcel 2149  wnel 3070  Vcvv 3463   class class class wbr 5113  dom cdm 5662   DProd cdprd 20065
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-10 2182  ax-11 2198  ax-12 2219  ax-ext 2741  ax-sep 5261  ax-pr 5405  ax-un 7733
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-nf 1811  df-sb 2098  df-mo 2573  df-eu 2603  df-clab 2748  df-cleq 2761  df-clel 2844  df-nfc 2918  df-nel 3071  df-ral 3086  df-rex 3096  df-rab 3424  df-v 3465  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4493  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4877  df-br 5114  df-opab 5178  df-xp 5668  df-rel 5669  df-cnv 5670  df-dm 5672  df-rn 5673  df-oprab 7415  df-mpo 7416  df-dprd 20067
This theorem is referenced by:  dprdcntz  20080  dprddisj  20081  dprdw  20082  dprdwd  20083  dprdfid  20089  dprdfinv  20091  dprdfadd  20092  dprdfsub  20093  dprdfeq0  20094  dprdf11  20095  dprdlub  20098  dprdres  20100  dprdss  20101  dprdf1o  20104  dmdprdsplitlem  20109  dprddisj2  20111  dmdprdsplit2  20118  dpjfval  20127  dpjidcl  20130
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