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Fully abstract from static to gradual
Full text linksponsorship: This work was funded in part by Internal Funds KU Leuven grant C14/18/064. Amin Timany was a postdoctoral fellow of the Flemish research fund (FWO) during parts of this project. This material is based upon work supported by the Air Force Office of Scientific Research under award number FA9550-21-1-0054. This work was partly supported by the Fund for Scientific Research -Flanders (FWO). (Internal Funds KU Leuven|C14/18/064, Air Force Office of Scientific Research|FA9550-21-1-0054, Fund for Scientific Research - Flanders (FWO))status: Published onlin
The future is ours: prophecy variables in separation logic
Full text linkEarly in the development of Hoare logic, Owicki and Gries introduced auxiliary variables as a way of encoding information about the history of a program’s execution that is useful for verifying its correctness. Over a decade later, Abadi and Lamport observed that it is sometimes also necessary to know in advance what a program will do in the future. To address this need, they proposed prophecy variables, originally as a proof technique for refinement mappings between state machines. However, despite the fact that prophecy variables are a clearly useful reasoning mechanism, there is (surprisingly) almost no work that attempts to integrate them into Hoare logic. In this paper, we present the first account of prophecy variables in a Hoare-style program logic that is flexible enough to verify logical atomicity (a relative of linearizability) for classic examples from the concurrency literature like RDCSS and the Herlihy-Wing queue. Our account is formalized in the Iris framework for separation logic in Coq. It makes essential use of ownership to encode the exclusive right to resolve a prophecy, which in turn enables us to enforce soundness of prophecies with a very simple set of proof rules.sponsorship: European Commission|731453status: Published onlin
Categories: FSCD 2016
No full text<p>This is the version of the category theory development corresponding to the FSCD 2016 paper:</p>
<p>Category Theory in Coq 8.5<br />
By Amin Timany and Bart Jacobs<br />
(to appear) in FSCD 2016, 22-26 of June 2016, Porto, Portugal</p>
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Category Theory in Coq 8.5
Full text linkWe report on our experience implementing category theory in Coq 8.5.
Our work formalizes most of basic category theory, including concepts
not covered by existing formalizations, in a library that is fit to be
used as a general-purpose category-theoretical foundation.
Our development particularly takes advantage of two features new to
Coq 8.5: primitive projections for records and universe polymorphism.
Primitive projections allow for well-behaved dualities while universe
polymorphism provides a relative notion of largeness and smallness.
The latter is one of the main contributions of this paper. It pushes
the limits of the new universe polymorphism and constraint inference
algorithm of Coq 8.5.
In this paper we present in detail smallness and largeness in
categories and the foundation they are built on top of. We
furthermore explain how we have used the universe polymorphism of Coq 8.5
to represent smallness and largeness arguments by simply ignoring
them and entrusting them to the universe inference algorithm of Coq 8.5.
We also briefly discuss our experience throughout this
implementation, discuss concepts formalized in this development and
give a comparison with a few other developments of similar extent
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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