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math.LO2014★ 1 cited
Decomposition Theorems and Model-Checking for the Modal -Calculus
Mikolaj Bojanczyk, Christoph Dittmann, Stephan Kreutzer
We prove a general decomposition theorem for the modal -calculus in the spirit of Feferman and Vaught's theorem for disjoint unions. In particular, we show that if a struc…
math.LO2012★ 1 cited
Rigidity is undecidable
Mikołaj Bojanczyk, Stanisław Szawiel, Marek Zawadowski
We show that the problem `whether a finite set of regular-linear axioms defines a rigid theory' is undecidable.