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)

is mentioned

In prior sections: mb event system 1 mb event system 2 mb event system 3 mb event system 5

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