The Destroying Angel

Destroying Civilization, Destroying Nature

Destroying the messenger

Big mammals have big (or slow) cells C ells use two basic strategies to adapt to the size of the organism in which they reside, say Van Savage and colleagues. Depending on how often they divide, comparable cells in a mouse and an elephant differ in either metabolic rate or cell volume, but usually not both. The need for such adaptation stems from simple geometry. As body volume increases, surfa...

The Angel wins

The angel-devil game is played on an infinite two-dimensional “chessboard” Z. The squares of the board are all white at the beginning. The players called angel and devil take turns in their steps. When it is the devil’s turn, he can turn a square black. The angel always stays on a white square, and when it is her turn she can fly at a distance of at most J steps (each of which can be horizontal...

Permutations Destroying Arithmetic Structure

Given a linear form C1X1 + · · · + CnXn, with coefficients in the integers, we characterize exactly the countably infinite abelian groups G for which there exists a permutation f that maps all solutions (α1, . . . , αn) ∈ Gn (with the αi not all equal) to the equation C1X1+ · · ·+CnXn = 0 to non-solutions. This generalises a result of Hegarty about permutations of an abelian group avoiding arit...

Entrepreneur - Business Angel Relationships

This paper examines the logics and expectations of entrepreneurs and business angels prior to going into a relationship. Comparisons of the entrepreneurs and the business angels show difference regarding their confidence about their own mind-sets and expectations. The findings are discussed taking an institutional approach; an exogenous institutionalism is influencing the actor, as his logic an...