Originally published in 1933, in partnership with the Institute of Actuaries Students' Society, this book was written to provide actuarial students with an introduction to the operations of friendly societies. The text is highly accessible, avoiding references to external sources in favour of a more interconnected account of the subject. A concise bibliography is also included. This book will be of value to anyone with an interest in the history of friendly societies.

The explanatory gap refers to the lack of concepts for understanding “how it is that . . . a state of consciousness comes about as a result of irritating nervous tissue.” By assuming that there are colours in the outside world, Block needlessly widens this gap and Lycan and Kitcher simply fail to see the gap. When such assumptions are abandoned, an unnecessary and incomprehensible constraint disappears. It then becomes clear that the brain can use its own neural language for (...) representing aspects of the outside world. While this may not close the gap, it becomes clearer where we need new concepts. (shrink)

On Roger Bacon's life and works, by A. G. Little. -- Der Einfluss des Robert Grosseteste auf die wissenschaftliche Richtung des Roger Bacon, von L. Baur. -- La place de Roger Bacon parmi les philosophes du xiie siècle, par F. Picavet. -- Roger Bacon and the Latin vulgate, by F. A. Gasquet. -- Roger Bacon and philology, by S. A. Hirsch. -- The place of Roger Bacon in the history of mathematics, by D. E. Smith. -- Roger Bacon und seine (...) Verdienste um die Optik, von E. Wiedemann. -- Roger Bacon's Lehre von der sinnlichen Spezies und vom Sehvorgange, von S. Vogl. -- Roger Bacon's art des wissenschaftlichen Arbeitens dargestellt nach seineer Schrift De speculis, von Würschmidt. -- Roger Bacon et l'horreur du vide, par P. Duhem. -- Roger Bacon : his relations to alchemy and chemistry, by M. M. P. Muir. -- Roger Bacon and gunpowder, by H. W. L. Hime. -- Roger Bacon and medicine, by E. W, Withington. -- Roger Bacon in English literature, by Sir J. E. Sandys. -- Roger Bacon's works with references to the mss. printed editions, by A, G. Little (p. [375]-425). (shrink)

No philosopher is needed to say where reality may be found. The fool no less than the wise man is in direct touch with real existence at every moment of his waking or dreaming life. To find reality might be a problem for timeless gods beyond the flux of nature—if timeless gods can be said to have problems—but natural creatures encounter reality at every turn. Nor need we look to the philosopher for knowledge. A division of labor having been made (...) between philosopher and scientist, it is to the scientist that we turn for most of our knowledge. Nevertheless, tasks for the philosopher remain and one of these is to make clear what knowledge is, for, to have knowledge is one thing; to know what knowledge is, is another. Science, we may safely assume, constitutes our best claim to knowledge but not all who know their science can say why it is knowledge. (shrink)

This book constitutes the refereed proceedings of the International Conference on Spatial Information Theory, COSIT 2005, held in Elliottville, NY, USA in September 2005. The 30 revised full papers presented were carefully reviewed and selected from 82 submissions. The papers are organized in topical sections on vagueness, uncertainty, and gradation; paths and routes; ontologies and semantics; ontologies and spatial relations; spatial reasoning: cognitive maps and spatial reasoning; time, change, and dynamics; landmarks and navigation; geographic information, and spatial behaviour.

Работа будет полезной для специалистов в сфере аналитической и прикладной геометрии, а также студентов и аспирантов компьютерных и математических специальностей профильных вузов.

Adolescence methamphetamine use is an issue of considerable concern due to its correlation with later delinquency, divorce, unemployment and health problems. Understanding how adolescents initiate methamphetamine abuse is important in developing effective prevention programs. We formulate a mathematical model for the spread of methamphetamine abuse using nonlinear ordinary differential equations. It is assumed that susceptibles are recruited into methamphetamine use through imitation. An epidemic threshold value, Ra\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathcal {R}}_a$$\end{document}, termed the abuse reproduction (...) number, is proposed and defined herein in the drug-using context. The model is shown to exhibit the phenomenon of backward bifurcation. This means that methamphetamine problems may persist in the population even if Ra\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathcal {R}}_a$$\end{document} is less than one. Sensitivity analysis of Ra\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathcal {R}}_a$$\end{document} was performed to determine the relative importance of different parameters in methamphetamine abuse initiation. The model is then fitted to data on methamphetamine users less than 20 years old reporting methamphetamine as their primary substance of abuse in the treatment centres of Cape Town and parameter values that give the best fit are chosen. Results show that the proportion of methamphetamine users less than 20 years old reporting methamphetamine as their primary substance of abuse will continue to decrease in Cape Town of South Africa. The results suggest that intervention programs targeted at reducing adolescence methamphetamine abuse, are positively impacting methamphetamine abuse. (shrink)