Reply to van Leeuwen

186-197 van Leeuwen fall 04

This major international history project succeeded because of the goodwill, commitment, and collaborative endeavor of a team of researchers drawn not only from different countries but also from different disciplines. Its immediate product is a recently published book, HISCO: Historical International Standard Classification of Occupations (van Leeuwen, Maas, and Miles 2002). The authors describe...

Conformal profiles in theHilhorst – van Leeuwen model

We study the critical energy and magnetization profiles for the Ising quantum chain with a marginal extended surface perturbation of the form A/y, y being the distance from the surface (Hilhorst-van Leeuwen model). For weak local couplings, A < Ac, the model displays a continuous surface transition with A-dependent exponents, whereas, for A > Ac, there is surface order at the bulk critical poin...

Vydrov and Van Voorhis reply

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Thirty Years of Collaboration with Jan van Leeuwen: In Search of Understanding Computation

I have collaborated with Jan van Leeuwen since the beginning of the 1980s. The non-standard models of computations have been the central subject of our joint work. Among these models, we focused especially onto realistic models of supercomputers, interactive computing, hypercomputing, characterization of contemporary computing in terms of extended Turing machine paradigm, and viewing computatio...

Reply to van Hoorn: Converging lines of evidence.