Preface .

Kernels and Expansions in Semigroup Theory
Using Category Theory
*Kernels and Expansions: An Historical and Technical
Perspective*
S.	W. Margolis

Monoid Kernels, Semidirect Products and their Adjoint Relationship
B.	Tilson

Cohomological Results in Monoid and Category Theory via Classifying Spaces
M.	Nunes

Gaps in Categories
J.	McCammond

Implicit Operations: A Use of Universal Algebra
*Implicit Operations on Pseudo—Varieties: An Introduction
P.	Weil

* Recent Developments in the Theory of Implicit Operations
J.	Almeida Implicit Operations on DS

A.	Azevedo

III	Inverse Monoids via Combinatoric and Geometric Methods The Word Problem for Inverse Monoids and
Related Questions
J.	B. Stephen

*Denotes an expository paper.
Graph Immersions and Inverse Monoids
	S.	W. Margolis and J. Meakin	14

Wreath Products and Varieties of Inverse Semigroups D. F. Cowan

Varieties of Semigroups and Universal Algebra

Pseudovarieties of Completely Regular Monoids F. Pastijn

Free Regular Unary Semigroups
L.	Polak

The Word Problem for Relatively Free
Completely Regular Semigroups
P.	G. Trotter
Weak Word Problem for Finite Semigroups
	M.	Sapir	2

* Local Varieties of Completely Regular Semigroups P. R. Jones and M. B. Szendrei

Comnmutative Semigroup Varieties with Modular Subvariety Lattices
B.	M. Vernikov and M. V. Volkov

V	Linear Semigroup and Monoids of Lie Type
* Linear Representations of Semigroups

J.	Okninski

*Finite Monoids of Lie Type

L.	E. Renner

*Monoids of Lie Type and Group Representations M. S. Putcha

Orthodox Algebraic Monoids
L.	E. Renner

The Monoid Generated by Projections in a
Kac—Moody Lie Algebra
K.	C. Misra and M. S. Putcha
Congruences on Monoids of Lie Type
M.	K. Augustine

* Elementary Representation and Character Theory
of Finite Semigroups and its Applications
J.	Rhodes and Y. Zalcstein                       

VI	Monoids Acting on Trees

*Monoids Acting on Trees: Elliptic and Wreath
Products and the Holonomy Theorem for Arbitrary Monoids J. Rhodes                                    

VII	The Synthesis Theorem and Regular Semigroups
*The Synthesis Theorem
J.-C. Birget

A Structure Theory for Finite Regular Semigroups D. Allen, Jr
*Biordered Sets: A Tool for Constructing Semigroups
D.	Easdown

VIII	Type—Il Conjecture

*The Type—Il Conjecture: A Survey
K.	Henckell

The Theorem of Knast, the PG = BG and
Type—II Conjectures
K.	Henckell and J. Rhodes

IX	Applications
*Automata Logical and Computational Complexity
H.	Straubing

Formulas, Numerical Predicates and Recognizable Languages
P.	Péladeau                                  

On Some Decision Problems in Finite Automata H. Leung

List of Participants