### Book

## Proceedings of the Joint Meeting of the Twenty-Third EACSL Annual Conference on Computer Science Logic (CSL) and the Twenty-Ninth Annual ACM / IEEE Symposium on Logic in Computer Science (LICS)

This volume contains the proceedings of the Joint Meeting of the Twenty-Third Annual EACSL Conference on Computer Science Logic (CSL) and the Twenty-Ninth Annual ACM/ IEEE Symposium on Logic in Computer Science (LICS). CSL is the annual meeting of the European Association for Computer Science Logic (EACSL) intended for computer scientists whose research activities involve logic, as well as for logicians working on issues significant for computer science. LICS is an annual international forum on theoretical and practical topics in computer science that relate to logic. Every 3--4 years, LICS has been part of the Federated Logic Conference (FLoC). Given that FLoC was to be held as part of the Vienna Summer of Logic (VSL) during July 2014, the organizers of CSL and LICS have chosen to merge the 2014 editions of these meetings into a single event within FLoC and VSL. Thus, in 2014, the joint meeting had one program committee, one program, and one proceedings.

We investigate the succinctness problem for conjunctive query rewritings over *OWL 2QL* ontologies of depth 1 and 2 by means of hypergraph programs computing Boolean functions. Both positive and negative results are obtained. We show that, over ontologies of depth 1, conjunctive queries have polynomial-size nonrecursive datalog rewritings; tree-shaped queries have polynomial positive existential rewritings; however, in the worst case, positive existential rewritings can be superpolynomial. Over ontologies of depth 2, positive existential and nonrecursive datalog rewritings of conjunctive queries can suffer an exponential blowup, while first-order rewritings can be superpolynomial unless NP ⊆ P/poly. We also analyse rewritings of tree-shaped queries over arbitrary ontologies and note that query entailment for such queries is fixed-parameter tractable.

Full 20-page version is available here:

http://arxiv.org/abs/1401.4420

In this early paper C. Wright Mills tries to ground the possibility for the study of thinking (including logical) from the perspective of sociology of knowledge. Following G.H. Mead, he shows that thinking is a social process because every thinker converses with his or her audience using the norms of rationality and logicality common to his or her culture. Language serves as a mediator between thinking and social patterns. Proposing to consider the meaning of language as the common social behavior evoked by it, Mills finds a way to combine three levels of analysis: psychological, social and cultural.

The article analyses the link between the famous French epistemologists Emile Meyerson and his younger friend and disciple, historian of science Alexandre Koyré. Koyré is known primarily by his research of the history of the scientific thought; his main interest was to grasp the moments of the transformation of rational structures within the history. Nevertheless, in this paper I will argue that Alexandre Koyré in some measure accepts Emile Meyerson’s claim on the immutability of human reason that constitutes the central point of Meyerson’s epistemology. But within the rationality in general he distinguishes the immutable core that is constituted by the logical laws of reasoning and the outer level of “mentality” which is subjected to the historical changes and transformations.

The present volume is devoted to the 'Open Rusian-Finish Colloquium on Logic' (ORFIC), held at the Saint-Petersburg State University, on June 14-16, 2012. Among the participants there were such prominent Finish logicians as Jaakko Hintikka, Ilkka Niiniluoto ang Gabriel Sandu. The volume covers the most interesting results recently obtained in different areas of research in logic.

This volume is of interest to everyone, concerned in modern logic.

We consider certain spaces of functions on the circle, which naturally appear in harmonic analysis, and superposition operators on these spaces. We study the following question: which functions have the property that each their superposition with a homeomorphism of the circle belongs to a given space? We also study the multidimensional case.

We consider the spaces of functions on the m-dimensional torus, whose Fourier transform is p -summable. We obtain estimates for the norms of the exponential functions deformed by a C1 -smooth phase. The results generalize to the multidimensional case the one-dimensional results obtained by the author earlier in “Quantitative estimates in the Beurling—Helson theorem”, Sbornik: Mathematics, 201:12 (2010), 1811 – 1836.

We consider the spaces of function on the circle whose Fourier transform is p-summable. We obtain estimates for the norms of exponential functions deformed by a C1 -smooth phase.

This proceedings publication is a compilation of selected contributions from the “Third International Conference on the Dynamics of Information Systems” which took place at the University of Florida, Gainesville, February 16–18, 2011. The purpose of this conference was to bring together scientists and engineers from industry, government, and academia in order to exchange new discoveries and results in a broad range of topics relevant to the theory and practice of dynamics of information systems. Dynamics of Information Systems: Mathematical Foundation presents state-of-the art research and is intended for graduate students and researchers interested in some of the most recent discoveries in information theory and dynamical systems. Scientists in other disciplines may also benefit from the applications of new developments to their own area of study.