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Semigroups 26 Semigroups of operators 9 Semigroup algebras 4 Algebra 3 Operator theory 3 Algebra, Universal 2 Banach spaces 2 Linear operators 2 Markov processes 2 Monoids 2 Spectral theory (Mathematics) 2 Algorithms 1 Boundary value problems 1 Categories (Mathematics) 1 Cohomology operations 1 Combinatorial analysis 1 Commutative algebra 1 Commutative rings 1 Commutative semigroups 1 Computer science 1 Congruences (Geometry) 1 Convolutions (Mathematics) 1 Cree Indians 1 Differentiable dynamical systems 1 Differential equations, Partial 1 Evolution equations 1 Finite groups 1 Functional analysis 1 Functional equations 1 Galois modules (Algebra) 1