Starting with an updated description of Allen’s calculus, the book
proceeds with a description of the main qualitative calculi which
have been developed over the last two decades. It describes
the connection of complexity issues to geometric properties. Models
of the formalisms are described using the algebraic notion of weak
representations of the associated algebras. The book also includes
a presentation of fuzzy extensions of qualitative calculi, and a
description of the study of complexity in terms of clones of
operations.

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