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Definition df-disj 3737
Description: A collection of classes is disjoint when for each element , it is in for at most one . (Contributed by Mario Carneiro, 14-Nov-2016.) (Revised by NM, 16-Jun-2017.)
Assertion
Ref Expression
df-disj Disj
Distinct variable groups:   ,   ,   ,
Allowed substitution hints:   ()   ()

Detailed syntax breakdown of Definition df-disj
StepHypRef Expression
1 vx . . 3  setvar
2 cA . . 3
3 cB . . 3
41, 2, 3wdisj 3736 . 2 Disj
5 vy . . . . . 6  setvar
65cv 1241 . . . . 5
76, 3wcel 1390 . . . 4
87, 1, 2wrmo 2303 . . 3
98, 5wal 1240 . 2
104, 9wb 98 1 Disj
Colors of variables: wff set class
This definition is referenced by:  dfdisj2  3738  disjss2  3739  cbvdisj  3746  nfdisj1  3749
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