subtyping - How to define Subtypes in Isabelle and what they mean? -

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the question regarding subtyping in isabelle lengthy here. simple question how can define type b subtype of if define below:

typedecl

by doing make operations , relations defined on (they not printed here) accessible elements of type b.

a bit more complex example define b , c subtype of such b , c disjoint, , every element of either of type b or of type c.

thanks

isabelle not have subtypes, although aspects of subtyping can emulated explained in thread. if want use same operation on different types, may want isabelle's type classes.


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