John Howie

TL;DR: Inverse semigroups as discussed by the authors are a subclass of regular semigroup classes and can be seen as semigroup amalgamations of semigroup groups, which is a special case of regular semiigroups.

TL;DR: In this paper, the Galois group theory was used to define a ring and field extension for geometrical applications to Geometry, including the following: Ring and Fields, Integral Domains and Polynomials, Field Extensions, Splitting Fields, Finite Fields, Galois Group, Equations and Groups, Some Group Theory, Regular Polygons, Solutions

TL;DR: This textbook presents an introduction to the theory of automata and to their connections with the study of languages.