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Mirrors > Home > ILE Home > Th. List > df-un | Unicode version |
Description: Define the union of two classes. Definition 5.6 of [TakeutiZaring] p. 16. Contrast this operation with difference (df-dif 2975) and intersection (df-in 2979). (Contributed by NM, 23-Aug-1993.) |
Ref | Expression |
---|---|
df-un |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cA | . . 3 | |
2 | cB | . . 3 | |
3 | 1, 2 | cun 2971 | . 2 |
4 | vx | . . . . . 6 | |
5 | 4 | cv 1283 | . . . . 5 |
6 | 5, 1 | wcel 1433 | . . . 4 |
7 | 5, 2 | wcel 1433 | . . . 4 |
8 | 6, 7 | wo 661 | . . 3 |
9 | 8, 4 | cab 2067 | . 2 |
10 | 3, 9 | wceq 1284 | 1 |
Colors of variables: wff set class |
This definition is referenced by: elun 3113 nfun 3128 unipr 3615 iinuniss 3758 bdcun 10653 |
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