Perfect colourings of isonemal fabrics by thin striping

Perfect colouring of isonemal fabrics by thin striping of warp and weft and the closely related topic of isonemal prefabrics that fall apart are reconsidered and their relation further explored. The catalogue of isonemal prefabrics that fall apart is extended to order 20 for those of even genus.Comment: 25 pages, 20 figure

The Path to Gun Control in America Goes through Political Philosophy

This essay argues that gun control in America is a philosophical as well as a policy debate. This explains the depth of acrimony it causes. It also explains why the technocratic public health argument favored by the gun control movement has been so unsuccessful in persuading opponents and motivating supporters. My analysis also yields some positive advice for advocates of gun control: take the political philosophy of the gun rights movement seriously and take up the challenge of showing that a society without guns is a better society, not merely a safer one

Liberty and Property in the Patent Law

Patents have seldom troubled civil libertarians. A specialized form of property, patents seemed pertinent to the technologies of traditional industry but little else. Patent instruments offered their readers mere technical documentation; patent cases presented no more than the mapping of a text onto an instantiated artifact; patent policy was principally oriented toward economic optimization of the length and scope of protection. Unbound from technology, contemporary patent law now seems a more robust discipline. Modern patent instruments appropriate a diverse array of techniques that span the entire range of human endeavor. Patent claims, cut loose from physical moorings, have grown more abstract and oriented toward human behavior. We have yet to realize fully the consequences of postindustrial patenting, but the potential impact of the patent law upon personal liberties is becoming more apparent and more worthy of concern. Although the principles of the patent canon demonstrate sufficient flexibility to regulate uses of such inventions as software, business methods, and genetic fragments, they persist in bearing little regard for civil rights. The private rule making, made possible through the patent law, holds the potential to impinge upon individual liberties in ways not previously considered possible

Coded Cooperative Data Exchange for a Secret Key

We consider a coded cooperative data exchange problem with the goal of generating a secret key. Specifically, we investigate the number of public transmissions required for a set of clients to agree on a secret key with probability one, subject to the constraint that it remains private from an eavesdropper. Although the problems are closely related, we prove that secret key generation with fewest number of linear transmissions is NP-hard, while it is known that the analogous problem in traditional cooperative data exchange can be solved in polynomial time. In doing this, we completely characterize the best possible performance of linear coding schemes, and also prove that linear codes can be strictly suboptimal. Finally, we extend the single-key results to characterize the minimum number of public transmissions required to generate a desired integer number of statistically independent secret keys.Comment: Full version of a paper that appeared at ISIT 2014. 19 pages, 2 figure

Research note: Measuring cultural values - The case of residents' attitudes to the Saltaire Festival

This research note discusses the findings and methodological issues arising from a cultural values survey of residents, particularly in relation to civic pride. In addition to offering insights to the particular case - the Saltaire Festival in the north of England - it provides an approach that might be used elsewhere

Theory of the Nucleon Spin-Polarizabilities II

Following up on the plenary talk given by Ulf Mei{\ss}ner, I discuss a generalization of the concept of nucleon spin-polarizabilities in terms of multipole excitation/de-excitation and present an overview of the available theoretical predictions for these elusive but interesting structure parameters of the nucleon.Comment: 4 pages, uses World Scientific style ws-p8-50x6-00.cls; talk given at GDH2000 meeting, Mainz, German