scholarly journals An Abstract Approach to Polychromatic Coloring: Shallow Hitting Sets in ABA-free Hypergraphs and Pseudohalfplanes

Author(s):  
Balázs Keszegh ◽  
Dömötör Pálvölgyi
2021 ◽  
pp. 1-11
Author(s):  
George A. Hazelrigg ◽  
Donald G. Saari

Abstract The derivation of a theory of systems engineering has long been complicated by the fact that there is little consensus within the systems engineering community regarding precisely what systems engineering is, what systems engineers do, and what might constitute reasonable systems engineering practices. To date, attempts at theories fail to accommodate even a sizable fraction of the current systems engineering community, and they fail to present a test of validity of systems theories, analytical methods, procedures or practices. This paper presents a more theoretical and more abstract approach to the derivation of a theory of systems engineering that has the potential to accommodate a broad segment of the systems engineering community and present a validity test. It is based on a simple preference statement: “I want the best system I can get.” From this statement, it is argued that a very rich theory can be obtained. Whereas most engineering disciplines are framed around a core set of widely accepted physical laws, to the authors' knowledge, this is the first attempt to frame an engineering discipline around a preference.


ChemInform ◽  
2013 ◽  
Vol 44 (36) ◽  
pp. no-no
Author(s):  
Weibing Liu ◽  
Liquan Tan ◽  
Peng Zhou ◽  
Cui Chen ◽  
Qing Zhang
Keyword(s):  

Author(s):  
R. W. Ianni

To the impressive list of Italian periodicals on international law led by the prestigious Rivista di Diritto Internazionale there has now been added The Italian Yearbook of International Law, published exclusively in English. Italian scholars have made a very significant contribution to doctrinal developments in international law; however, some of their work has gone unnoticed because Italian is not among the languages in widespread use in international law circles. In addition, Italian scholarship has suffered somewhat from what some consider to be an overly theoretical or abstract approach to the subject matter. While it is always a noteworthy occasion to welcome a new member into the family of international law yearbooks, the advent of the Italian yearbook is particularly noteworthy, contributing as it does to the accessibility of a broad range of material and learned comment. It is appropriate, therefore, that the first issues of The Italian Yearbook of International Law receive extended comment in the pages of this Yearbook.


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