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Definition df-un 2916
Description: Define the union of two classes. Definition 5.6 of [TakeutiZaring] p. 16. Contrast this operation with difference  \ (df-dif 2914) and intersection  i^i (df-in 2918). (Contributed by NM, 23-Aug-1993.)
Assertion
Ref Expression
df-un  u.  {  |  }
Distinct variable groups:   ,   ,

Detailed syntax breakdown of Definition df-un
StepHypRef Expression
1 cA . . 3
2 cB . . 3
31, 2cun 2909 . 2  u.
4 vx . . . . . 6  setvar
54cv 1241 . . . . 5
65, 1wcel 1390 . . . 4
75, 2wcel 1390 . . . 4
86, 7wo 628 . . 3
98, 4cab 2023 . 2  {  |  }
103, 9wceq 1242 1  u.  {  |  }
Colors of variables: wff set class
This definition is referenced by:  elun  3078  nfun  3093  unipr  3585  iinuniss  3728  bdcun  9317
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