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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 3062 | . . 3 ⊢ (dom 𝑆 ∉ V ↔ ¬ dom 𝑆 ∈ V) | |
| 2 | dmexg 7915 | . . . 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 20220 | . . 3 ⊢ Rel dom DProd | |
| 6 | 5 | ovprc2 7462 | . 2 ⊢ (¬ 𝑆 ∈ V → (𝐺 DProd 𝑆) = ∅) |
| 7 | 4, 6 | syl 18 | 1 ⊢ (dom 𝑆 ∉ V → (𝐺 DProd 𝑆) = ∅) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 = wceq 1569 ∈ wcel 2144 ∉ wnel 3061 Vcvv 3450 ∅c0 4277 dom cdm 5650 (class class class)co 7422 DProd cdprd 20216 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pr 5390 ax-un 7753 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3897 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-xp 5656 df-rel 5657 df-cnv 5658 df-dm 5660 df-rn 5661 df-iota 6496 df-fv 6549 df-ov 7425 df-oprab 7426 df-mpo 7427 df-dprd 20218 |
| This theorem is used by: (None) |
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