Konrad Knopp book lot  Theory of Functions Parts I & II and Problem Book in The Theory of Functions Vol I

lot of three vintage Konrad Knopp books includes:
Theory of Functions Part I elements of the general theory of analytic functions, SBN 486601560, Dover Publications, copyright 1945
Theory of Functions Part II applications and further development of the general theory, ISBN 0486601579, Dover Publications, copyright 1947
Problem Book In The Theory of Functions Volume I Problems in the Elementary Theory of Functions, Library of Congress Card Number 49-7400, copyright 1948

condition: acceptable - serviceable vintage paperback books.  significant cover wear including surface rubbing/scratching/edge wear, heavy cover creases, staining inside covers and on page edges, name written inside front covers, pencil marks/handwriting/underlining inside text.

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