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Java classes implementing set theory relation concepts
...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.
Superficially, Dominoes on Acid is a solitaire variant of Dominoes with weird colorful tiles. But on a deeper level it is a GUI for natural deduction. Every completed domino is equivalent to a proof of a tautology in classical propositional logic.
A tool for proof theorists to study deduction systems and to develop proof search strategies for them. GraPE should eventually support step-by-step proof construction, automatic proof search with various strategies, proof transformations and analysis.