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| Mirrors > Home > MPE Home > Th. List > Mathboxes > cnvepresdmqs | Structured version Visualization version GIF version | ||
| Description: The domain quotient predicate for the restricted converse epsilon relation is equivalent to the negated elementhood of the empty set in the restriction. (Contributed by Peter Mazsa, 14-Aug-2021.) |
| Ref | Expression |
|---|---|
| cnvepresdmqs | ⊢ ((◡ E ↾ 𝐴) DomainQs 𝐴 ↔ ¬ ∅ ∈ 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-dmqs 39656 | . 2 ⊢ ((◡ E ↾ 𝐴) DomainQs 𝐴 ↔ (dom (◡ E ↾ 𝐴) / (◡ E ↾ 𝐴)) = 𝐴) | |
| 2 | n0el3 39669 | . 2 ⊢ (¬ ∅ ∈ 𝐴 ↔ (dom (◡ E ↾ 𝐴) / (◡ E ↾ 𝐴)) = 𝐴) | |
| 3 | 1, 2 | bitr4i 281 | 1 ⊢ ((◡ E ↾ 𝐴) DomainQs 𝐴 ↔ ¬ ∅ ∈ 𝐴) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 ↔ wb 209 = wceq 1569 ∈ wcel 2144 ∅c0 4278 E cep 5549 ◡ccnv 5649 dom cdm 5650 ↾ cres 5652 / cqs 8716 DomainQs wdmqs 39140 |
| 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 |
| 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-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3896 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-sn 4584 df-pr 4586 df-op 4590 df-br 5103 df-opab 5167 df-eprel 5550 df-xp 5656 df-rel 5657 df-cnv 5658 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-ec 8719 df-qs 8723 df-dmqs 39656 |
| This theorem is used by: dfmembpart2 39806 |
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