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Abstract: Sensible /spl lambda/-theories are equational extensions of the untyped lambda calculus that equate all the unsolvable /spl lambda/-terms and are closed under derivation. A longstanding open ...

Abstract: In this article, we consider the hierarchy of the modal μ-calculus over reflexive and symmetric graphs and show that in this class the modal μ-calculus hierarchy is infinite. In the proof, a ...

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