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Definition df-uni 4250
Description: Define the union of a class i.e. the collection of all members of the members of the class. Definition 5.5 of [TakeutiZaring] p. 16. For example, (ex-uni 25147). This is similar to the union of two classes df-un 3480. (Contributed by NM, 23-Aug-1993.)
Assertion
Ref Expression
df-uni
Distinct variable group:   , ,

Detailed syntax breakdown of Definition df-uni
StepHypRef Expression
1 cA . . 3
21cuni 4249 . 2
3 vx . . . . . 6
4 vy . . . . . 6
53, 4wel 1819 . . . . 5
64cv 1394 . . . . . 6
76, 1wcel 1818 . . . . 5
85, 7wa 369 . . . 4
98, 4wex 1612 . . 3
109, 3cab 2442 . 2
112, 10wceq 1395 1
Colors of variables: wff setvar class
This definition is referenced by:  dfuni2  4251  eluni  4252  unipr  4262  csbuni  4277  csbunigOLD  4278  uniuni  6609  csbunigVD  33698
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