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Book Description Hardcover. Condition: Very Good++ EX-LIBRARY. Dust Jacket Condition: No dust jacket. First Printing of the First Edition. New York, London, Sydney, Toronto:: Wiley Interscience, 1969. A square, tight copy. Inner hinges are perfect. WITHDRAWN stamp, and a few other library markings on the endpapers. Text pages are clean, crisp, and unmarked. No underlining. No highlighting. No margin notes. Volume XXII in PURE AND APPLIED MATHEMATICS, A SERIES OF TEXTS AND MONOGRAPHS, edited by R. Courant, L. Bers, and J.J. Stoker. List of chapter notes/comments. Bibliography. Index of Notation. Subject Index. Bound in the original pale gray cloth, lettered/decorated in black and red on the spine and front cover. First printing of the hardcover (clothbound) edition, with complete number row (10 987654321) on the copyright page. Lester La Verne Helms (1927-) received his Ph. D. from Purdue University in 1956. He is Emeritus Professor, Department of Mathematics, University of Illinois at Urbana-Champaign. . First Printing of the First Edition. Hard Cover. Very Good++ EX-LIBRARY./No dust jacket. 8vo. ix, 282pp. Seller Inventory # 007196