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| Mirrors > Home > MPE Home > Th. List > copab | Structured version Visualization version GIF version | ||
| Description: Extend class notation to include ordered-pair class abstraction (class builder). |
| Ref | Expression |
|---|---|
| wph | wff 𝜑 |
| vx | setvar 𝑥 |
| vy | setvar 𝑦 |
| Ref | Expression |
|---|---|
| copab | class {〈𝑥, 𝑦〉 ∣ 𝜑} |
| Colors of variables: wff setvar class |
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