Titlebook: Dick de Jongh on Intuitionistic and Provability Logics; Nick Bezhanishvili,Rosalie Iemhoff,Fan Yang Book 2024 The Editor(s) (if applicable

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Lewisian Fixed Points I: Two Incomparable Constructions,omparable, we axiomatize their join and investigate several subtheories, whose axioms are obtained as fixed points of simple formulas. We also show that both . and . are ., that is, their validity in the corresponding preservativity logic of a given arithmetical theory transfers to its finite extensions.

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Well Partial Orders, some related key results by Diana Schmidt. Then we discuss generalized trees, their embeddability relation and their associated maximal order types. These results can be condensed neatly into the formula .. At the end we cover Friedman style miniaturizations of Kruskal’s theorem and their associated phase transitions.

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calorie

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An Overview of Verbrugge Semantics, a.k.a. Generalised Veltman Semantics,ss proofs become simpler and the richer semantics will allow for filtration arguments as opposed to regular Veltman semantics. This paper aims to give an overview of results and applications of Verbrugge semantics up to the current date.

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Axiomatizing Origami Planes,ions between these logical theories and theories of fields as described in Makowsky (.). Using a theorem of Ziegler (.) which implies that the first order theory of Vieta fields is undecidable, we conclude that the first order theory of our axiomatization of origami is also undecidable.

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Dick de Jongh on Intuitionistic and Provability Logics