Theorem dprddomprc 19121

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 3124	. . 3 ⊢ (dom 𝑆 ∉ V ↔ ¬ dom 𝑆 ∈ V)
2		dmexg 7612	. . . 4 ⊢ (𝑆 ∈ V → dom 𝑆 ∈ V)
3	2	con3i 157	. . 3 ⊢ (¬ dom 𝑆 ∈ V → ¬ 𝑆 ∈ V)
4	1, 3	sylbi 219	. 2 ⊢ (dom 𝑆 ∉ V → ¬ 𝑆 ∈ V)
5		reldmdprd 19118	. . 3 ⊢ Rel dom DProd
6	5	brrelex2i 5608	. 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 2110   ∉ wnel 3123  Vcvv 3494   class class class wbr 5065  dom cdm 5554   DProd cdprd 19114

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793  ax-sep 5202  ax-nul 5209  ax-pr 5329  ax-un 7460

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-nel 3124  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-nul 4291  df-if 4467  df-sn 4567  df-pr 4569  df-op 4573  df-uni 4838  df-br 5066  df-opab 5128  df-xp 5560  df-rel 5561  df-cnv 5562  df-dm 5564  df-rn 5565  df-oprab 7159  df-mpo 7160  df-dprd 19116

This theorem is referenced by:  dprddomcld  19122  dprdsubg  19145