Theorem dprddomprc 18445

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 2927	. . 3 ⊢ (dom 𝑆 ∉ V ↔ ¬ dom 𝑆 ∈ V)
2		dmexg 7139	. . . 4 ⊢ (𝑆 ∈ V → dom 𝑆 ∈ V)
3	2	con3i 150	. . 3 ⊢ (¬ dom 𝑆 ∈ V → ¬ 𝑆 ∈ V)
4	1, 3	sylbi 207	. 2 ⊢ (dom 𝑆 ∉ V → ¬ 𝑆 ∈ V)
5		reldmdprd 18442	. . 3 ⊢ Rel dom DProd
6	5	brrelex2i 5193	. 2 ⊢ (𝐺dom DProd 𝑆 → 𝑆 ∈ V)
7	4, 6	nsyl 135	1 ⊢ (dom 𝑆 ∉ V → ¬ 𝐺dom DProd 𝑆)

Syntax hints:  ¬ wn 3   → wi 4   ∈ wcel 2030   ∉ wnel 2926  Vcvv 3231   class class class wbr 4685  dom cdm 5143   DProd cdprd 18438

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pr 4936  ax-un 6991

This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-nel 2927  df-ral 2946  df-rex 2947  df-rab 2950  df-v 3233  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-br 4686  df-opab 4746  df-xp 5149  df-rel 5150  df-cnv 5151  df-dm 5153  df-rn 5154  df-oprab 6694  df-mpt2 6695  df-dprd 18440

This theorem is referenced by:  dprddomcld  18446  dprdsubg  18469