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Theorem dprddomprc 20025
Description: A family of subgroups indexed by a proper class cannot be a family of subgroups for an internal direct product. (Contributed by AV, 13-Jul-2019.)
Assertion
Ref Expression
dprddomprc (dom 𝑆 ∉ V → ¬ 𝐺dom DProd 𝑆)

Proof of Theorem dprddomprc
StepHypRef Expression
1 df-nel 3061 . . 3 (dom 𝑆 ∉ V ↔ ¬ dom 𝑆 ∈ V)
2 dmexg 7878 . . . 4 (𝑆 ∈ V → dom 𝑆 ∈ V)
32con3i 154 . . 3 (¬ dom 𝑆 ∈ V → ¬ 𝑆 ∈ V)
41, 3sylbi 219 . 2 (dom 𝑆 ∉ V → ¬ 𝑆 ∈ V)
5 reldmdprd 20022 . . 3 Rel dom DProd
65brrelex2i 5702 . 2 (𝐺dom DProd 𝑆𝑆 ∈ V)
74, 6nsyl 140 1 (dom 𝑆 ∉ V → ¬ 𝐺dom DProd 𝑆)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wcel 2141  wnel 3060  Vcvv 3453   class class class wbr 5099  dom cdm 5645   DProd cdprd 20018
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 5245  ax-pr 5389  ax-un 7714
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-nel 3061  df-ral 3076  df-rex 3086  df-rab 3414  df-v 3455  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4480  df-sn 4582  df-pr 4584  df-op 4588  df-uni 4865  df-br 5100  df-opab 5162  df-xp 5651  df-rel 5652  df-cnv 5653  df-dm 5655  df-rn 5656  df-oprab 7396  df-mpo 7397  df-dprd 20020
This theorem is referenced by:  dprddomcld  20026  dprdsubg  20049
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