@MISC{Araújo_tutorial-, author = {Isabel Araújo and Andrew Solomon}, title = {Tutorial - Computing with Semigroups in GAP}, year = {} }
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emigroups, and Rees matrix semigroups; 3. The power set semigroup will be of interest to potential GAP developers, showing how to create new types of multiplicative elements, and how to use finitely presented semigroups, semigroup homomorphisms and the built in Todd-Coxeter enumerator; 4. Endomorphisms of the symmetric group deals with selecting element representation for efficiency, moving between semigroups using isomorphisms, and studying semigroups whose elements are themselves homomorphisms; 5. The Heisenberg group showcases GAP's features for working with infinite finitely presented semigroups, such as the Knuth-Bendix procedure. 1 Endomorphisms of a finite chain In this section we use GAP to investigate the structure of O n , the semigroup of endomorphisms of a finite chain. The user will gain experience in working with: ffl transformation semigroups; ffl congruences and Rees congruences; ffl Green's relations, Green's classes and eggboxes. Consider the set [n] = f1; 2;