Theorem dprddomprc 19115

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

Step	Hyp	Ref	Expression
1		df-nel 3092	. . 3 ⊢ (dom 𝑆 ∉ V ↔ ¬ dom 𝑆 ∈ V)
2		dmexg 7594	. . . 4 ⊢ (𝑆 ∈ V → dom 𝑆 ∈ V)
3	2	con3i 157	. . 3 ⊢ (¬ dom 𝑆 ∈ V → ¬ 𝑆 ∈ V)
4	1, 3	sylbi 220	. 2 ⊢ (dom 𝑆 ∉ V → ¬ 𝑆 ∈ V)
5		reldmdprd 19112	. . 3 ⊢ Rel dom DProd
6	5	brrelex2i 5573	. 2 ⊢ (𝐺dom DProd 𝑆 → 𝑆 ∈ V)
7	4, 6	nsyl 142	1 ⊢ (dom 𝑆 ∉ V → ¬ 𝐺dom DProd 𝑆)

Syntax hints:  ¬ wn 3   → wi 4   ∈ wcel 2111   ∉ wnel 3091  Vcvv 3441   class class class wbr 5030  dom cdm 5519   DProd cdprd 19108

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770  ax-sep 5167  ax-nul 5174  ax-pr 5295  ax-un 7441

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2598  df-eu 2629  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-nel 3092  df-ral 3111  df-rex 3112  df-rab 3115  df-v 3443  df-dif 3884  df-un 3886  df-in 3888  df-ss 3898  df-nul 4244  df-if 4426  df-sn 4526  df-pr 4528  df-op 4532  df-uni 4801  df-br 5031  df-opab 5093  df-xp 5525  df-rel 5526  df-cnv 5527  df-dm 5529  df-rn 5530  df-oprab 7139  df-mpo 7140  df-dprd 19110

This theorem is referenced by:  dprddomcld  19116  dprdsubg  19139