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| Mirrors > Home > MPE Home > Th. List > Mathboxes > pet02 | Structured version Visualization version GIF version | ||
| Description: Class 𝐴 is a partition by the null class if and only if the cosets by the null class are in equivalence relation on it. (Contributed by Peter Mazsa, 31-Dec-2021.) |
| Ref | Expression |
|---|---|
| pet02 | ⊢ (( Disj ∅ ∧ (dom ∅ / ∅) = 𝐴) ↔ ( EqvRel ≀ ∅ ∧ (dom ≀ ∅ / ≀ ∅) = 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | disjALTV0 39923 | . 2 ⊢ Disj ∅ | |
| 2 | 1 | petlemi 39985 | 1 ⊢ (( Disj ∅ ∧ (dom ∅ / ∅) = 𝐴) ↔ ( EqvRel ≀ ∅ ∧ (dom ≀ ∅ / ≀ ∅) = 𝐴)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 ∧ wa 401 = wceq 1569 ∅c0 4277 dom cdm 5651 / cqs 8724 ≀ ccoss 39252 EqvRel weqvrel 39269 Disj wdisjALTV 39288 |
| 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-pr 5391 |
| 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-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ral 3077 df-rex 3087 df-rmo 3365 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-br 5103 df-opab 5167 df-id 5546 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-ec 8727 df-qs 8731 df-coss 39570 df-refrel 39661 df-cnvrefrel 39676 df-symrel 39693 df-trrel 39727 df-eqvrel 39738 df-disjALTV 39859 |
| This theorem is used by: pet0 39987 |
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