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Mathbox for Peter Mazsa |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > df-disjs | Structured version Visualization version GIF version |
Description: Define the disjoint
relations class, i.e., the class of disjoints. We
need Disjs for the definition of Parts and Part
for the
Partition-Equivalence Theorems: this need for Parts as disjoint relations
on their domain quotients is the reason why we must define Disjs
instead of simply using converse functions (cf. dfdisjALTV 38122).
The element of the class of disjoints and the disjoint predicate are the same, that is (𝑅 ∈ Disjs ↔ Disj 𝑅) when 𝑅 is a set, see eldisjsdisj 38136. Alternate definitions are dfdisjs 38117, ... , dfdisjs5 38121. (Contributed by Peter Mazsa, 17-Jul-2021.) |
Ref | Expression |
---|---|
df-disjs | ⊢ Disjs = ( Disjss ∩ Rels ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cdisjs 37616 | . 2 class Disjs | |
2 | cdisjss 37615 | . . 3 class Disjss | |
3 | crels 37585 | . . 3 class Rels | |
4 | 2, 3 | cin 3943 | . 2 class ( Disjss ∩ Rels ) |
5 | 1, 4 | wceq 1534 | 1 wff Disjs = ( Disjss ∩ Rels ) |
Colors of variables: wff setvar class |
This definition is referenced by: dfdisjs 38117 |
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