— In recent years, idempotent methods (specifically, max-plus methods) have been developed for solution of nonlinear control problems. It was thought that idempotent linearity o...
Symmetry in constraint problems can be exploited to greatly improve search performance. A form of symmetry that has been the subject of considerable research is value interchangeab...
We present a new formalization of the algebraic hierarchy in Coq, exploiting its new type class mechanism to make practical a solution formerly thought infeasible. Our approach add...
Quine introduced a famous distinction between the `notional' sense and the `relational' sense of certain attitude verbs. The distinction is both intuitive and sound but i...
In this paper, we describe a thread of research which we have followed off and on at Cambridge for about three years. Our topic is the security of electronic documents, in the bro...