Operator theory is a cornerstone of functional analysis concerned with the study of linear mappings on infinite-dimensional spaces. It encompasses bounded and unbounded operators, spectral theory, ...

About the author:Martin Walter is the co-author of the chapter: " An explicit duality for finite groups" and is a professor in the Deparment of Mathematics at the University of Colorado Boulder. Book ...

Yale’s Daniel Spielman, Sterling Professor of Computer Science, professor of statistics and data science, and professor of mathematics, who helped solve a problem that had vexed mathematicians for ...

Spectral theory of differential operators examines the set of values—known as the spectrum—that characterise the behaviour of solutions to linear differential equations. At its core lies the analysis ...