The Deligne-Simpson problem is formulated like this: give necessary and sufficient conditions for the choice of the conjugacy classes Cj ⊂ SL(n,C) or cj ⊂ sl(n,C) so that there exist irreducible (p + 1)-tuples of matrices Mj ∈ Cj or Aj ∈ cj satisfying the equality M1 . . .Mp+1 = I or A1 + . . .+Ap+1 = 0. We solve the problem for generic eigenvalues with the exception of the case of matrices Mj ...

In the current issue of the Journal, Tu et al. (1) show convincingly that if there is no correlation between birth weight and blood pressure but both are positively correlated with current weight (which they are), then adjustment for current weight can induce a negative correlation between birth weight and blood pressure. This demonstration may be important in stimulating epidemiologists to ret...

Information security is a very important component in the context of an organization’s dependence on ICT. The operational environment where these technologies are operating is a very complex one. Offering a good level of protection by information security process needs a well defined managerial framework. This paper discusses the reasons why having a well defined managerial security framework i...

Copyright©The Oceanographic Society of Japan/TERRAPUB/Springer observed between sufficiently mixed regions and highly stratified regions (Simpson and Hunter, 1974; Bowers and Simpson, 1987; Zhao et al., 2001), which are generally characterized by sharp horizontal salinity or temperature gradients and are able to block the free exchange of materials effectively. Therefore, a better understanding...

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