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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 3040 | . . 3 ⊢ (dom 𝑆 ∉ V ↔ ¬ dom 𝑆 ∈ V) | |
| 2 | dmexg 7848 | . . . 4 ⊢ (𝑆 ∈ V → dom 𝑆 ∈ V) | |
| 3 | 2 | con3i 154 | . . 3 ⊢ (¬ dom 𝑆 ∈ V → ¬ 𝑆 ∈ V) |
| 4 | 1, 3 | sylbi 218 | . 2 ⊢ (dom 𝑆 ∉ V → ¬ 𝑆 ∈ V) |
| 5 | reldmdprd 19972 | . . 3 ⊢ Rel dom DProd | |
| 6 | 5 | brrelex2i 5682 | . 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 2119 ∉ wnel 3039 Vcvv 3432 class class class wbr 5079 dom cdm 5625 DProd cdprd 19968 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2712 ax-sep 5225 ax-pr 5369 ax-un 7685 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2719 df-cleq 2732 df-clel 2815 df-nfc 2889 df-nel 3040 df-ral 3055 df-rex 3065 df-rab 3393 df-v 3434 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4269 df-if 4462 df-sn 4563 df-pr 4565 df-op 4569 df-uni 4846 df-br 5080 df-opab 5142 df-xp 5631 df-rel 5632 df-cnv 5633 df-dm 5635 df-rn 5636 df-oprab 7367 df-mpo 7368 df-dprd 19970 |
| This theorem is referenced by: dprddomcld 19976 dprdsubg 19999 |
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