Known facts: the decision problem of the existence of a kernel in a digraph G = (V; E) is NP-complete; if all of the cycles of G have even length, then G has a kernel; and the question of the number of kernels is #P-complete even for this restricted class of digraphs. We construct game theory tools, of independent interest, concerning strategies in the presence of draw positions, to show, in th...

The aim of this introductory lecture is to review the arguments, according to which the symmetry properties of the strong interaction reveal themselves at low energies. I first discuss the symmetries of QCD, then sketch the method used to work out their implications and finally take up a few specific issues, where new experimental results are of particular interest to test the predictions. Talk...

After giving a panoramic view of the " textbook " interpretation of the new quantum mechanics, as a sequel to the old quantum theory, the conceptual basis of quantum theory since the Copenhagen Interpretation is reviewed in the context of various proposals since Einstein and Niels Bohr, designed to throw light on possible new facets bearing on its foundations, the key issues to its inherent " i...

This article constructs a theoretical framework enabling the logic of plausibility to be axiomatised and for decisions about plausibility to be automated. One result is that undecidability presented in the initial theory is resolved. To arrive at a logical-mathematical basis of the theory of plausibility an axiomatization of plausibility logic based on notions of evidence is proposed. It is thr...

In formulating chemical-reactivity theory (CRT) so as to give it a deep foundation in density-functional theory (DFT), Parr, his collaborators, and subsequent workers have introduced reactivity indices as properties of isolated reactants, some of which are in apparent conflict with the underlying DFT. Indices which are first derivatives with respect to electron number are staircase functions of...

This paper describes a specific zigzag theory structure and relates its application to the information systems field. The foundations discussed are related to reality, knowledge, action and theory structure. The zigzag theory structure can be differentiated and used to describe task processes such as information systems development, and the use of information systems in business processes.