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Theorem dprddomcld 19984
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 3037 . . . . 5 (dom 𝑆 ∉ V ↔ ¬ dom 𝑆 ∈ V)
4 dprddomprc 19983 . . . . 5 (dom 𝑆 ∉ V → ¬ 𝐺dom DProd 𝑆)
53, 4sylbir 235 . . . 4 (¬ dom 𝑆 ∈ V → ¬ 𝐺dom DProd 𝑆)
65con4i 114 . . 3 (𝐺dom DProd 𝑆 → dom 𝑆 ∈ V)
7 eleq1 2822 . . 3 (dom 𝑆 = 𝐼 → (dom 𝑆 ∈ V ↔ 𝐼 ∈ V))
86, 7imbitrid 244 . 2 (dom 𝑆 = 𝐼 → (𝐺dom DProd 𝑆𝐼 ∈ V))
91, 2, 8sylc 65 1 (𝜑𝐼 ∈ V)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4   = wceq 1540  wcel 2108  wnel 3036  Vcvv 3459   class class class wbr 5119  dom cdm 5654   DProd cdprd 19976
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2157  ax-12 2177  ax-ext 2707  ax-sep 5266  ax-nul 5276  ax-pr 5402  ax-un 7729
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2065  df-mo 2539  df-eu 2568  df-clab 2714  df-cleq 2727  df-clel 2809  df-nfc 2885  df-nel 3037  df-ral 3052  df-rex 3061  df-rab 3416  df-v 3461  df-dif 3929  df-un 3931  df-in 3933  df-ss 3943  df-nul 4309  df-if 4501  df-sn 4602  df-pr 4604  df-op 4608  df-uni 4884  df-br 5120  df-opab 5182  df-xp 5660  df-rel 5661  df-cnv 5662  df-dm 5664  df-rn 5665  df-oprab 7409  df-mpo 7410  df-dprd 19978
This theorem is referenced by:  dprdcntz  19991  dprddisj  19992  dprdw  19993  dprdwd  19994  dprdfid  20000  dprdfinv  20002  dprdfadd  20003  dprdfsub  20004  dprdfeq0  20005  dprdf11  20006  dprdlub  20009  dprdres  20011  dprdss  20012  dprdf1o  20015  dmdprdsplitlem  20020  dprddisj2  20022  dmdprdsplit2  20029  dpjfval  20038  dpjidcl  20041
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