T H I S I S S U E O F Semigroup Forum C O N T A I N S A R T I C L E S D E D I C A T E D TO T H E M E M O R Y O F
ALFRED HOBLITZELLE CLIFFORD J u l y 11, 1908 D e c e m b e r 27, 1992 DISTINGUISHED ALGEBRAIST, CO-FOUNDER AND UNDISPUTED LEADER IN THE THEORY OF SEMIGROUPS, HAVING INFLUENCED WITH HIS CHARISMA AND PROBING MIND GENERATIONS OF ALGEBRAISTS--STUDENTS AND COLLEAGUES ALIKE, AFTER iIAVING BEEN ASSISTANT TO HERMAN WEYL AT THE INSTITUTE FOR ADVANCED STUDY FROM 1936 TO 1 9 3 8 , AFTER HAVING TAUGHT AT THE MASSACHUSETTS INSTITUTE OF TECHNOLOGY FROM 1938 UNTIL 1 9 4 2 , AND HAVING SERVED HIS COUNTRY WITH DISTINCTION IN THE SECOND WORLD WAR AND AGAIN DURING THE KOREAN CONFLICT, AFTER BEING ASSOCIATE PROFESSOR AT JOHNS HOPKINS UNIVERSITY FROM 1946 TO 1 9 5 5 , JOINED TULANE UNIVERSITY IN 1955 AS PROFESSOR OF MATHEMATICS AND HEAD OF THE DEPARTMENT OF MATHEMATICS AT SOPHIE NEWCOMB COLLEGE, CO-FOUNDER OF SEMIGROUP FORUM DURING THE YEARS OF 1968 THROUGH 1970, MANAGING EDITOR THROUGH 1972 AND EDITOR THROUGH 1 9 7 6 , GAVE TO T i l e FULLEST TO THE SEMIGROUP RESEARCH COMMUNITY AS A SCHOLAR, AS A TEACHER, AND AS A COLLEAGUE
Foreword The following contributions contained in this issue are dedicated to the memory of ALFRED HOBLITZELLE CLIFFORD:
Mark Beintema and Gregory Budzban
The structure of Lie groups and their supports on topological semigroups
Jerome A. Goldstein
Applications of operator semigroups to Fourier analysis
Peter Higgins
Epics from locally inverse semigroups are onto
Jimmie D. Lawson
The earliest semigroup paper?
Jonathan Leech
Recent developments in the theory of skew lattices
Ken MagiIl, Jr.
Properties of a pair of functions which generate a dense subsemigroup of S ( X )
Prabudh R. Misra
Some monothetic subsemigroups of S(R)
Mdria Szendrei
The bifree regular E-solid semigroups
P. G. Trotter and M. V. Volkov
The finite basis problem in the pseudovariety joins of aperiodic semigroups with groups
Joel VanderWerf
Wreath products of algebras: generalizing the Krohn-Rhodes Theorem to arbitrary algebras
W i t h the exception of the articles by PETER HIGGINS, MARIA SZENDREI, and P. C. TROTTER AND M. V. VOLKOV, the papers in this issue are based on contributions delivered at the CONFERENCE ON SEMIGROUP TttEORY AND ITS APPLICATIONS held at Tulane University from March 28 to March 30, 1994 in honor of A. H. CLIFFORD. His life and work have been described by DONALD D. MILLER 1 a n d GORDON B. PRESTON 2 in Volume 7 of Semigroup Forum. T h a t volume was dedicated in its entirety to A. H. CLIFFORD and A. D. \VALLACE and their contributions to tile theory of semigroups. The bibliography representing A. H. CLIFFORD's complete published work which is presented on the following pages includes the bibliography published in 19733 but is complemented by the works published since the appearance of that volume. More recent notes bearing on A. H. CLIFFORD's life and work may be found in a Volume of Proceedings of the Tulane Conference of 1994 edited by KARL H. HOFMANN and ~ [ I C H A E L W . M I S L O V E 4 . T h a t volume is comprised mainly of papers written by the invited speakers at the Tulane conference.
1 A.H. Clifford: The first sixty-five years, Semigroup Forum 7 (1974), 4-9. 2 A.H. Clifford: an appreciation of his work on the occasion of his sixty-fifth birthday, Semigroup Forum 7 (1974), 32-57. 3 See PRESTON loc. cir. pp. 52-54. 4 "Semigroup Theory and Its Applications: Proceedings of the 1994 Conference Colnmemorating the Work of A. H. Clifford," Lond. Math. Soc. Lecture Notes Series, Cambridge Univ. Press 1996, to appear; see notably D. D. MILLER, Reminiscences of a friendship; G. B. PRESTON, A. H. Clifford's work on union of groups; J. RHODES, The relationship of Al Clifford's work to the current theory of semigroups; K. H. HOFMANNand J. D. LAWSON, Linearly ordered semigroups: The early history and A. II. Clifford's influence.
