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Theorem dprddomprc 19675
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 3047 . . 3 (dom 𝑆 ∉ V ↔ ¬ dom 𝑆 ∈ V)
2 dmexg 7796 . . . 4 (𝑆 ∈ V → dom 𝑆 ∈ V)
32con3i 154 . . 3 (¬ dom 𝑆 ∈ V → ¬ 𝑆 ∈ V)
41, 3sylbi 216 . 2 (dom 𝑆 ∉ V → ¬ 𝑆 ∈ V)
5 reldmdprd 19672 . . 3 Rel dom DProd
65brrelex2i 5662 . 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 2105  wnel 3046  Vcvv 3440   class class class wbr 5086  dom cdm 5607   DProd cdprd 19668
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1912  ax-6 1970  ax-7 2010  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2153  ax-12 2170  ax-ext 2707  ax-sep 5237  ax-nul 5244  ax-pr 5366  ax-un 7629
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1781  df-nf 1785  df-sb 2067  df-mo 2538  df-eu 2567  df-clab 2714  df-cleq 2728  df-clel 2814  df-nfc 2886  df-nel 3047  df-ral 3062  df-rex 3071  df-rab 3404  df-v 3442  df-dif 3899  df-un 3901  df-in 3903  df-ss 3913  df-nul 4267  df-if 4471  df-sn 4571  df-pr 4573  df-op 4577  df-uni 4850  df-br 5087  df-opab 5149  df-xp 5613  df-rel 5614  df-cnv 5615  df-dm 5617  df-rn 5618  df-oprab 7320  df-mpo 7321  df-dprd 19670
This theorem is referenced by:  dprddomcld  19676  dprdsubg  19699
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