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Mirrors > Home > MPE Home > Th. List > Mathboxes > n0eldmqs | Structured version Visualization version GIF version |
Description: The empty set is not an element of a domain quotient. (Contributed by Peter Mazsa, 2-Mar-2018.) |
Ref | Expression |
---|---|
n0eldmqs | ⊢ ¬ ∅ ∈ (dom 𝑅 / 𝑅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssid 3989 | . 2 ⊢ dom 𝑅 ⊆ dom 𝑅 | |
2 | n0elqs 35598 | . 2 ⊢ (¬ ∅ ∈ (dom 𝑅 / 𝑅) ↔ dom 𝑅 ⊆ dom 𝑅) | |
3 | 1, 2 | mpbir 233 | 1 ⊢ ¬ ∅ ∈ (dom 𝑅 / 𝑅) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∈ wcel 2114 ⊆ wss 3936 ∅c0 4291 dom cdm 5555 / cqs 8288 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pr 5330 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-sbc 3773 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-sn 4568 df-pr 4570 df-op 4574 df-br 5067 df-opab 5129 df-xp 5561 df-cnv 5563 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-ec 8291 df-qs 8295 |
This theorem is referenced by: n0eldmqseq 35899 |
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