Who Cites is discrete?
is_discrete	Def  A Discrete == x,y:A. Dec(x = y)
	Thm*  A:Type. (A Discrete)  Prop
decidable	Def  Dec(P) == P  P
	Thm*  A:Prop. Dec(A)  Prop
not	Def  A == A  False
	Thm*  A:Prop. (A)  Prop

Syntax:

A Discrete

has structure:

is_discrete(A)

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