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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 3063 | . . 3 ⊢ (dom 𝑆 ∉ V ↔ ¬ dom 𝑆 ∈ V) | |
| 2 | dmexg 7902 | . . . 4 ⊢ (𝑆 ∈ V → dom 𝑆 ∈ V) | |
| 3 | 2 | con3i 155 | . . 3 ⊢ (¬ dom 𝑆 ∈ V → ¬ 𝑆 ∈ V) |
| 4 | 1, 3 | sylbi 220 | . 2 ⊢ (dom 𝑆 ∉ V → ¬ 𝑆 ∈ V) |
| 5 | reldmdprd 20193 | . . 3 ⊢ Rel dom DProd | |
| 6 | 5 | brrelex2i 5708 | . 2 ⊢ (𝐺dom DProd 𝑆 → 𝑆 ∈ V) |
| 7 | 4, 6 | nsyl 141 | 1 ⊢ (dom 𝑆 ∉ V → ¬ 𝐺dom DProd 𝑆) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∈ wcel 2145 ∉ wnel 3062 Vcvv 3451 class class class wbr 5103 dom cdm 5651 DProd cdprd 20189 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-sep 5249 ax-pr 5391 ax-un 7740 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-nel 3063 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-xp 5657 df-rel 5658 df-cnv 5659 df-dm 5661 df-rn 5662 df-oprab 7416 df-mpo 7417 df-dprd 20191 |
| This theorem is used by: dprddomcld 20197 dprdsubg 20220 |
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