Environmental adversity and uncertainty favour cooperation. (2007)
Journal Article
(2007). Environmental adversity and uncertainty favour cooperation. BMC Evolutionary Biology, 240 - ?. https://doi.org/10.1186/1471-2148-7-240

BACKGROUND: A major cornerstone of evolutionary biology theory is the explanation of the emergence of cooperation in communities of selfish individuals. There is an unexplained tendency in the plant and animal world - with examples from alpine plants... Read More about Environmental adversity and uncertainty favour cooperation..

On the membership of invertible diagonal and scalar matrices (2007)
Journal Article
Bell, P. (2007). On the membership of invertible diagonal and scalar matrices. Theoretical Computer Science, 37 - 45. https://doi.org/10.1016/j.tcs.2006.11.011

In this paper, we consider decidability questions that are related to the membership problem in matrix semigroups. In particular, we consider the membership of a given invertible diagonal matrix in a matrix semigroup and then a scalar matrix, which h... Read More about On the membership of invertible diagonal and scalar matrices.

Infinity (2007)
Book Chapter
(2007). Infinity. In Philosophy of Logic, vol. 5 of the Handbook of the Philosophy of Science (523 -585)

This essay surveys the different types of infinity that occur in pure and applied mathematics, with emphasis on: 1. the contrast between potential infinity and actual infinity; 2. Cantor's distinction between transfinite sets and absolute infinity; 3... Read More about Infinity.