Metamath Proof Explorer


Theorem cpet

Description: The conventional form of Member Partition-Equivalence Theorem. In the conventional case there is no (general) disjoint and no (general) partition concept: mathematicians have been calling disjoint or partition what we call element disjoint or member partition, see also cpet2 . Cf. mpet , mpet2 and mpet3 for unconventional forms of Member Partition-Equivalence Theorem. Cf. pet and pet2 for Partition-Equivalence Theorem with general R . (Contributed by Peter Mazsa, 31-Dec-2024)

Ref Expression
Assertion cpet Could not format assertion : No typesetting found for |- ( MembPart A <-> ( EqvRel ~ A /\ ( U. A /. ~ A ) = A ) ) with typecode |-

Proof

Step Hyp Ref Expression
1 dfmembpart2 Could not format ( MembPart A <-> ( ElDisj A /\ -. (/) e. A ) ) : No typesetting found for |- ( MembPart A <-> ( ElDisj A /\ -. (/) e. A ) ) with typecode |-
2 cpet2 ElDisj A ¬ A EqvRel A A / A = A
3 1 2 bitri Could not format ( MembPart A <-> ( EqvRel ~ A /\ ( U. A /. ~ A ) = A ) ) : No typesetting found for |- ( MembPart A <-> ( EqvRel ~ A /\ ( U. A /. ~ A ) = A ) ) with typecode |-