Completion problems for operator matrices are concerned with the question of whether a partially specified operator matrix can be completed to form an operator

This book is devoted to a new direction in linear algebra and operator theory that deals with the invariants of partially specified matrices and operators, and

Intensive research in matrix completions, moments, and sums of Hermitian squares has yielded a multitude of results in recent decades. This book provides a comp

These two volumes constitute texts for graduate courses in linear operator theory. The reader is assumed to have a knowledge of both complex analysis and the fi

This volume consists of eight papers containing recent advances in interpolation theory for matrix functions and completion theory for matrices and operators. I