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| Mirrors > Home > ILE Home > Th. List > wb | GIF version | ||
| Description: Extend our wff definition to include the biconditional connective. |
| Ref | Expression |
|---|---|
| wph | wff 𝜑 |
| wps | wff 𝜓 |
| Ref | Expression |
|---|---|
| wb | wff (𝜑 ↔ 𝜓) |
| Colors of variables: wff set class |
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