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Mirrors > Home > MPE Home > Th. List > dprdval0prc | Structured version Visualization version GIF version |
Description: The internal direct product of a family of subgroups indexed by a proper class is empty. (Contributed by AV, 13-Jul-2019.) |
Ref | Expression |
---|---|
dprdval0prc | ⊢ (dom 𝑆 ∉ V → (𝐺 DProd 𝑆) = ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-nel 3048 | . . 3 ⊢ (dom 𝑆 ∉ V ↔ ¬ dom 𝑆 ∈ V) | |
2 | dmexg 7891 | . . . 4 ⊢ (𝑆 ∈ V → dom 𝑆 ∈ V) | |
3 | 2 | con3i 154 | . . 3 ⊢ (¬ dom 𝑆 ∈ V → ¬ 𝑆 ∈ V) |
4 | 1, 3 | sylbi 216 | . 2 ⊢ (dom 𝑆 ∉ V → ¬ 𝑆 ∈ V) |
5 | reldmdprd 19862 | . . 3 ⊢ Rel dom DProd | |
6 | 5 | ovprc2 7446 | . 2 ⊢ (¬ 𝑆 ∈ V → (𝐺 DProd 𝑆) = ∅) |
7 | 4, 6 | syl 17 | 1 ⊢ (dom 𝑆 ∉ V → (𝐺 DProd 𝑆) = ∅) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 = wceq 1542 ∈ wcel 2107 ∉ wnel 3047 Vcvv 3475 ∅c0 4322 dom cdm 5676 (class class class)co 7406 DProd cdprd 19858 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-sep 5299 ax-nul 5306 ax-pr 5427 ax-un 7722 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-nel 3048 df-ral 3063 df-rex 3072 df-rab 3434 df-v 3477 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-nul 4323 df-if 4529 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-br 5149 df-opab 5211 df-xp 5682 df-rel 5683 df-cnv 5684 df-dm 5686 df-rn 5687 df-iota 6493 df-fv 6549 df-ov 7409 df-oprab 7410 df-mpo 7411 df-dprd 19860 |
This theorem is referenced by: (None) |
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