semigroups Definition

commutative, are, ordered, generated, finite, dynamical, free, continuous, topological, abstract, regular, quantum, analytic, theory, operators, groups, generators, problem, transformations, class, equations, properties, algebras, attractors, automata, digraphs, discrete, eigenfunctions, functional, functionals, geometries, graphs, lagrangian, lattices, manifold, manifolds, mappings, matrices, models, permutation, polyhedra,