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NOTE: "[C] P(%xm)" is just a notation for %xm:XM. P(%xm)
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xmiddleDef XM == P:Prop. Dec(P)
Thm* XM{i}  Prop{i'}
decidableDef Dec(P) == P  P
Thm* A:Prop. Dec(A Prop
notDef A == A  False
Thm* A:Prop. (A Prop

Syntax:XM has structure: xmiddle{i:l}

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decidablememberpropimpliesorfalseall!abstraction
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Definitions StandardLib Sections NuprlLIB Doc