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Modalities in homotopy type theory [PDF]

open access: yesLogical Methods in Computer Science, 2020
Univalent homotopy type theory (HoTT) may be seen as a language for the category of $\infty$-groupoids. It is being developed as a new foundation for mathematics and as an internal language for (elementary) higher toposes.
Egbert Rijke   +2 more
doaj   +1 more source

Perfect Matching in Random Graphs is as Hard as Tseitin [PDF]

open access: yesTheoretiCS, 2022
We study the complexity of proving that a sparse random regular graph on an odd number of vertices does not have a perfect matching, and related problems involving each vertex being matched some pre-specified number of times.
Per Austrin, Kilian Risse
doaj   +1 more source

Extending the Extensional Lambda Calculus with Surjective Pairing is Conservative [PDF]

open access: yesLogical Methods in Computer Science, 2006
We answer Klop and de Vrijer's question whether adding surjective-pairing axioms to the extensional lambda calculus yields a conservative extension. The answer is positive. As a byproduct we obtain a "syntactic" proof that the extensional lambda calculus
Kristian Stoevring
doaj   +1 more source

Banach Spaces as Data Types [PDF]

open access: yesLogical Methods in Computer Science, 2011
We introduce the operators "modified limit" and "accumulation" on a Banach space, and we use this to define what we mean by being internally computable over the space.
Dag Normann
doaj   +1 more source

Near-Optimal Lower Bounds on Quantifier Depth and Weisfeiler–Leman Refinement Steps [PDF]

open access: yesLogic in Computer Science, 2016
We prove near-optimal trade-offs for quantifier depth versus number of variables in first-order logic by exhibiting pairs of n-element structures that can be distinguished by a k-variable first-order sentence but where every such sentence requires ...
Christoph Berkholz, Jakob Nordström
semanticscholar   +1 more source

A Proof of Kamp's theorem [PDF]

open access: yesLog. Methods Comput. Sci., 2014
We provide a simple proof of Kamp’s theorem.
A. Rabinovich
semanticscholar   +1 more source

On Constructor Rewrite Systems and the Lambda Calculus [PDF]

open access: yesLogical Methods in Computer Science, 2012
We prove that orthogonal constructor term rewrite systems and lambda-calculus with weak (i.e., no reduction is allowed under the scope of a lambda-abstraction) call-by-value reduction can simulate each other with a linear overhead.
Ugo Dal Lago, Simone Martini
doaj   +1 more source

Existence of strongly proper dyadic subbases [PDF]

open access: yesLogical Methods in Computer Science, 2017
We consider a topological space with its subbase which induces a coding for each point. Every second-countable Hausdorff space has a subbase that is the union of countably many pairs of disjoint open subsets.
Yasuyuki Tsukamoto
doaj   +1 more source

On the Monadic Second-Order Transduction Hierarchy [PDF]

open access: yesLogical Methods in Computer Science, 2010
We compare classes of finite relational structures via monadic second-order transductions. More precisely, we study the preorder where we set C \subseteq K if, and only if, there exists a transduction {\tau} such that C\subseteq{\tau}(K).
Achim Blumensath, Bruno Courcelle
doaj   +1 more source

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