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Object-oriented Programming in C#
Specialization, Extension, and Inheritance
The intension of class extensions

The intension of a class extension B is a superset of the intension of the original class A


The intension of a class A is blown up when the class is extended to B

It is, in general, not possible to characterize the extension of B in relation to the extension of A

Often, the extension of A does not overlap with the extension of B