plaques & signs
matrices of sign solvable linear systems
in a sign solvable linear system the signs of the coefficients determine the signs of some entries in the solution . this type of system is part of a larger study that helps researchers understand if properties of a matrix can be determined from combinatorial arrangements of its elements . in this book the authors present the diffuse body of literature on sign solvability as a coherent whole for the first time giving many new results and proofs and establishing many new connections . brualdi and shader describe and comment on algorithms implicit in many of the proofs and their complexity . the book is self contained assuming familiarity only with elementary linear algebra and graph theory . intended primarily for researchers in combinatorics and linear algebra it should also be of interest to computer scientists economists physicists chemists and engineers .