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%A Mujdat Pakkan %A Varol Akman %J Information Sciences: An International Journal %T HYPERSOLVER: A Graphical Tool for Commonsense Set Theory %X This paper investigates an alternative set theory (due to Peter Aczel) called Hyperset Theory. Aczel uses a graphical representation for sets and thereby allows the representation of non-well-founded sets. A program, called HYPERSOLVER, which can solve systems of equations defined in terms of sets in the universe of this new theory is presented. This may be a useful tool for commonsense reasoning. %N 1 %K ZF (Zermelo-Fraenkel) set theory, nonwellfounded sets (hypersets), AFA (anti-foundation axiom), the Solution Lemma, situation theory, HYPERSOLVER, Conway paradox. %P 43-61 %V 85 %D 1995 %L cogprints466