This series is devoted to the publication of research in all areas of pure and applied mathematics. Manuscripts accepted for publication are similar to those published in Transactions of the American Mathematical Society and meet the same editorial requirements. To qualify for publication, the manuscripts must be correct, new, significant, well-written, and of interest to a substantial number of mathematicians. Each issue contains either a single monograph or a group of related papers. The series is also available by subscription. (Nos. 1-122: LC 52-42839) (ISSN 0065-9266) Softcover.