Comfort, W. W. 1933- The theory of ultrafilters/ W. W. Comfort, S. Negrepontis. - Berlin ; New York: Springer-Verlag, 1974. - x, 482 p. ; 24 cm. - Grundlehren der mathematischen Wissenschaften. Bd. 211 . Includes index. Bibliography: p. [453]-471. ISBN: 3387066047 : DM98.00 LCCN: 74003673 //r853 Nat. Bib. No.: GFR*** Subjects--Topical Terms: Ultrafilters (Mathematics) Dewey Class. No.: 511.3 / C732t