If the company builds a big plant, it must live with it whatever the size of market demand. If it builds a small plant, management has the option of expanding the plant in two years in the event that demand is high during the introductory period; while in the event that demand is low during the introductory period, the company will maintain operations in the small plant and make a tidy profit o...

Dy f\ainarine vvnitenorn Eyre Methuen, 85p As a little something to take along to a hospital patient, this book has a great deal going for it. The pictures (by Bill Tidy), while lacking the great Giles' special brand of malicious hospital humour, are funny and reasonably apposite. The text is informative and lighthearted enough without being arch or gigglegiggle (a rare enough achievement in hu...

1 Clarity about Concessive Knowledge Attributions: Reply to Dodd Trent Dougherty Patrick Rysiew Recently, Dylan Dodd has tried to clear up what he takes to be some of the many confusions surrounding concessive knowledge attributions (CKAs) -i.e., utterances of the form “S knows that p, but it’s possible that q” (where q entails not-p) (Rysiew 2001). We agree with Dodd that there are a lot of mi...

A b-coloring of a graph is a coloring such that every color class admits a vertex adjacent to at least one vertex receiving each of the colors not assigned to it. The b-chromatic number of a graph G, denoted by χb(G), is the maximum number t such that G admits a b-coloring with t colors. A graph G is b-continuous if it admits a b-coloring with t colors, for every t = χ(G), . . . , χb(G), and it...

The well-known Reingold-Tilford algorithm produces tidy layered drawings of trees: drawings where all nodes at the same depth are vertically aligned. However, when nodes have varying heights, layered drawing may use more vertical space than necessary. A non-layered drawing of a tree places children at a fixed distance from the parent, thereby giving a more vertically compact drawing. Moreover, ...

Among the persistent mysteries in epigenetics are the criteria by which specific regions of the genome are chosen for deposition of distinguishing chromatin marks. Once a particular region is modified, will the newly acquired epigenetic state spill onto neighboring regions of the genome or be confined to tidy patches? The report by Henderson and Jacobsen in the the previous issue of Genes & Dev...

The authors are favored with a tidy, literate style, and the book makes straightforward reading. Illustrations are provided of each condition described and of the use of special techniques such as gel diffusion and immunofluorescence. These are of average quality, but are excellent when derived from the authors' own work, as on Sj6gren's disease. Each chapter has a fairly inclusive bibliography...

It has long been known that to minimise the heat emitted by a determin-istic computer during it's operation it is necessary to make the computation act in a logically reversible manner[Lan61]. Such logically reversible operations require a number of auxiliary bits to be stored, maintaining a history of the computation, and which allows the initial state to be reconstructed by running the comput...