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| Mirrors > Home > MPE Home > Th. List > dprddomprc | Structured version Visualization version GIF version | ||
| 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.) |
| Ref | Expression |
|---|---|
| dprddomprc | ⊢ (dom 𝑆 ∉ V → ¬ 𝐺dom DProd 𝑆) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-nel 3038 | . . 3 ⊢ (dom 𝑆 ∉ V ↔ ¬ dom 𝑆 ∈ V) | |
| 2 | dmexg 7853 | . . . 4 ⊢ (𝑆 ∈ V → dom 𝑆 ∈ V) | |
| 3 | 2 | con3i 154 | . . 3 ⊢ (¬ dom 𝑆 ∈ V → ¬ 𝑆 ∈ V) |
| 4 | 1, 3 | sylbi 217 | . 2 ⊢ (dom 𝑆 ∉ V → ¬ 𝑆 ∈ V) |
| 5 | reldmdprd 19940 | . . 3 ⊢ Rel dom DProd | |
| 6 | 5 | brrelex2i 5689 | . 2 ⊢ (𝐺dom DProd 𝑆 → 𝑆 ∈ V) |
| 7 | 4, 6 | nsyl 140 | 1 ⊢ (dom 𝑆 ∉ V → ¬ 𝐺dom DProd 𝑆) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∈ wcel 2114 ∉ wnel 3037 Vcvv 3442 class class class wbr 5100 dom cdm 5632 DProd cdprd 19936 |
| 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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5243 ax-pr 5379 ax-un 7690 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-nel 3038 df-ral 3053 df-rex 3063 df-rab 3402 df-v 3444 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-br 5101 df-opab 5163 df-xp 5638 df-rel 5639 df-cnv 5640 df-dm 5642 df-rn 5643 df-oprab 7372 df-mpo 7373 df-dprd 19938 |
| This theorem is referenced by: dprddomcld 19944 dprdsubg 19967 |
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