• A particular definition of a subtyping relation, called (strong) behavioral subtyping, that was initially introduced in 1987 by Barbara Liskov. The Liskov Substitution Principle is a semantic rather than merely syntactic relation, because it intends to guarantee semantic interoperability of types in a hierarchy, particularly of object types. Liskov’s notion of a behavioral subtype defines a notion of substitutability for objects; that is, if S is a subtype of T, then objects of type T in a program may be replaced with objects of type S without altering any of the desirable properties of that program (e.g., correctness). ← Wikipedia

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