Simple java classes implementing basic concepts of relations as defined in set theory. A relation is a set of ordered pairs. A relation can have properties, including that it is reflexive, symmetric, or transitive. The classes enable some ordered pairs to be stated, and will deduce all the other related ordered pairs implied by the relation's properties. There are implementations of transitive, reflexive-and-transitive, and symmetric-reflexive-and-transitive (equivalence) relations using hash sets and tree sets.
The current version (0.1) has been tested but not substantially used. Feedback from use in the field will be welcomed, as will offers of collaboration to improve the deduction algorithms.
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