This book should be of interest to students of animal ecology; ecology.

This expert volume in the Diagnostic Pathology series is an excellent point-of-care resource for practitioners at all levels of experience and training. Covering all areas of nonneoplastic pediatric pathology, it incorporates the most recent clinical, pathologic, and molecular knowledge in this challenging field to provide a comprehensive overview of all key issues relevant to today's practice. Richly illustrated and easy to use, Diagnostic Pathology: Nonneoplastic Pediatrics is a one-stop reference for accurate, complete pathology reports, ideal as a day-to-day reference for both pediatric and general pathologists or as a reliable training resource. Provides a clear framework for a better understanding of the clinical and histopathologic appearances of more than 270 nonneoplastic entities, covering every organ system with a focus on reactive, infectious, congenital, and genetic conditions Covers significant advances in this complex field, including recent molecular discoveries and updated disease entities, new information on multiple immunologic disorders, changes and expansions to several classification systems (such as WHO, Banff, and ISSVA), and updates in other scoring systems Contains new chapters on manifestations of pediatric COVID-19 infection, tumoral calcinosis, multiple skeletal dysplasia, skeletal muscle, collagenous gastritis and colitis, adenovirus appendicitis, intestinal pseudoobstruction, disorders of sexual development, and Kikuchi disease Includes approximately 3,000 high-quality clinical and histologic images, gross pathology images, radiologic images, and full-color illustrations to help practicing and in-training pathologists reach a confident diagnosis-as well as nearly 200 additional images online Employs consistently templated chapters and bulleted content for quick, expert reference at the point of care Includes an eBook version that enables you to access all text, figures, and references, with the ability to search, customize your content, make notes and highlights, and have content read aloud

This book should be of interest to students of animal ecology; ecology.

What could be regarded as the beginning of a theory of commutators AB - BA of operators A and B on a Hilbert space, considered as a dis cipline in itself, goes back at least to the two papers of Weyl [3] {1928} and von Neumann [2] {1931} on quantum mechanics and the commuta tion relations occurring there. Here A and B were unbounded self-adjoint operators satisfying the relation AB - BA = iI, in some appropriate sense, and the problem was that of establishing the essential uniqueness of the pair A and B. The study of commutators of bounded operators on a Hilbert space has a more recent origin, which can probably be pinpointed as the paper of Wintner [6] {1947}. An investigation of a few related topics in the subject is the main concern of this brief monograph. The ensuing work considers commuting or "almost" commuting quantities A and B, usually bounded or unbounded operators on a Hilbert space, but occasionally regarded as elements of some normed space. An attempt is made to stress the role of the commutator AB - BA, and to investigate its properties, as well as those of its components A and B when the latter are subject to various restrictions. Some applica tions of the results obtained are made to quantum mechanics, perturba tion theory, Laurent and Toeplitz operators, singular integral trans formations, and Jacobi matrices.