Definitions num thy 1 Sections StandardLIB Doc
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Some definitions of interest.
coprimeDef CoPrime(a,b) == GCD(a;b;1)
Thm* a,b:. CoPrime(a,b Prop
iffDef P  Q == (P  Q) & (P  Q)
Thm* A,B:Prop. (A  B Prop

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intnatural_numbermemberpropimpliesandall!abstraction
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Definitions num thy 1 Sections StandardLIB Doc