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Mirrors > Home > MPE Home > Th. List > w3a | Structured version Visualization version Unicode version |
Description: Extend wff definition to include three-way conjunction ('and'). |
Ref | Expression |
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wph |
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wps |
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wch |
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Ref | Expression |
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w3a |
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Colors of variables: wff setvar class |
Copyright terms: Public domain | W3C validator |