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Definition df-disjs 38113
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.)

Assertion
Ref Expression
df-disjs Disjs = ( Disjss ∩ Rels )

Detailed syntax breakdown of Definition df-disjs
StepHypRef Expression
1 cdisjs 37616 . 2 class Disjs
2 cdisjss 37615 . . 3 class Disjss
3 crels 37585 . . 3 class Rels
42, 3cin 3943 . 2 class ( Disjss ∩ Rels )
51, 4wceq 1534 1 wff Disjs = ( Disjss ∩ Rels )
Colors of variables: wff setvar class
This definition is referenced by:  dfdisjs  38117
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