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Definition df-un 2901
Description: Define the union of two classes. Definition 5.6 of [TakeutiZaring] p. 16. Contrast this operation with difference (AB) (df-dif 2899) and intersection (AB) (df-in 2903). (Contributed by NM, 23-Aug-1993.)
Assertion
Ref Expression
df-un (AB) = {x ∣ (x A x B)}
Distinct variable groups:   x,A   x,B

Detailed syntax breakdown of Definition df-un
StepHypRef Expression
1 cA . . 3 class A
2 cB . . 3 class B
31, 2cun 2894 . 2 class (AB)
4 vx . . . . . 6 setvar x
54cv 1373 . . . . 5 class x
65, 1wcel 1376 . . . 4 wff x A
75, 2wcel 1376 . . . 4 wff x B
86, 7wo 616 . . 3 wff (x A x B)
98, 4cab 2009 . 2 class {x ∣ (x A x B)}
103, 9wceq 1374 1 wff (AB) = {x ∣ (x A x B)}
Colors of variables: wff set class
This definition is referenced by:  elun  3063  nfun  3078  unipr  3547  iinuniss  3690
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