Who Cites strong-subtype?
strong-subtype	Def strong-subtype(A;B) Def == (A r B) Def == & ({b:B| a:A. b = a  B } r A) Def == & (a1,a2:A. a1 = a2  B  a1 = a2)

Syntax:

strong-subtype(A;B)

has structure:

strong-subtype(A; B)

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