The Weyr matrix canonical form is a largely unknown cousin of the Jordan canonical form. Discovered by Eduard Weyr in 1885, the Weyr form outperforms the Jordan form in a number of mathematical situations, yet it remains somewhat of a mystery, even to many who are skilled in linear algebra.

Written in an engaging style, this book presents various advanced topics in linear algebra linked through the Weyr form. Kevin O'Meara, John Clark, and Charles Vinsonhaler develop the Weyr form from scratch and include an algorithm for computing it. A fascinating duality exists between the Weyr form...

Whether knight's charger or beast of burden, horses played a vital role in medieval life. The wealth of medieval finds excavated in London in recent years has, not surprisingly, included many objects associated with horses. This catalogue illustrates and discusses over four hundred such objects, among them harness, horseshoes, spurs and curry combs, from the utilitarian to highly decorative pieces. London served by horse traffic comes vividly in view. The introductory chapter draws on historical as well as archaeological sources to consider the role of the horse in medieval London. It looks...