Perturbation Theory Eigenvalue Problems by Franz Rellich (2 results)

Soft cover. Condition: Near Fine. No Jacket. Perturbation Theory of Eigenvalue Problems Franz Rellich A classic and highly regarded monograph in mathematical physics and functional analysis, Perturbation Theory of Eigenvalue Problems by Franz Rellich is a foundational work on the behavior of eigenvalues and eigenvectors under small perturbations. Rellich s rigorous treatment has made this volume an essential reference for researchers and advanced students in mathematics, quantum mechanics, and theoretical physics. The book presents Rellich s influential results with clarity and precision, reflecting his lasting impact on operator theory and spectral analysis. Long valued for its depth and elegance, this title remains relevant for specialists studying differential operators, Hilbert space theory, and related fields. A desirable copy of an important scholarly work, well suited for mathematicians, physicists, academic libraries, and collectors of classic scientific texts. Condition: Very Good / Nearly Fine. The book is clean, bright, and tightly bound, showing only minimal signs of careful handling. Pages are crisp and unmarked, with no writing, highlighting, or library markings. Covers are well preserved with only light, age-appropriate wear. The only noted flaw is a former owner s name stamped on the front cover. Overall, a sharp, attractive copy that approaches Fine condition. (BR) Shelf 89.…

Hardcover. Condition: Gut. N.Y., Gordon & Breach (1969). gr.8. X, 127 p. OCloth. Notes on Mathematics and its Applications.- Name on flyleaf, photography mounted on flyleaf, otherwise in good condition.