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Mirrors > Home > MPE Home > Th. List > Mathboxes > n0eldmqseq | Structured version Visualization version GIF version |
Description: The empty set is not an element of a domain quotient. (Contributed by Peter Mazsa, 3-Nov-2018.) |
Ref | Expression |
---|---|
n0eldmqseq | ⊢ ((dom 𝑅 / 𝑅) = 𝐴 → ¬ ∅ ∈ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | n0eldmqs 36688 | . 2 ⊢ ¬ ∅ ∈ (dom 𝑅 / 𝑅) | |
2 | eleq2 2827 | . 2 ⊢ ((dom 𝑅 / 𝑅) = 𝐴 → (∅ ∈ (dom 𝑅 / 𝑅) ↔ ∅ ∈ 𝐴)) | |
3 | 1, 2 | mtbii 325 | 1 ⊢ ((dom 𝑅 / 𝑅) = 𝐴 → ¬ ∅ ∈ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 = wceq 1539 ∈ wcel 2108 ∅c0 4253 dom cdm 5580 / cqs 8455 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pr 5347 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-clab 2716 df-cleq 2730 df-clel 2817 df-ne 2943 df-ral 3068 df-rex 3069 df-rab 3072 df-v 3424 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4254 df-if 4457 df-sn 4559 df-pr 4561 df-op 4565 df-br 5071 df-opab 5133 df-xp 5586 df-cnv 5588 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-ec 8458 df-qs 8462 |
This theorem is referenced by: n0el3 36690 |
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