Subgroups of free idempotent generated semigroups need not be free

SEMIGROUPS AND COMBINATORIAL APPLICATIONS

John Howie · Bulletin of the London Mathematical Society · 1980 · 524 citations

Natural Sciences, Mathematics, Combinatorics +4

Algebraic Theory of Machines, Languages, and Semigroups

Richard E. Stearns, Michael A. Arbib · Mathematics of Computation · 1969 · 274 citations

Computing, Computer Science, Mathematics +11

Structure of regular semigroups. I

K. S. S. Nambooripad · Memoirs of the American Mathematical Society · 1979 · 244 citations

Natural Sciences, Property Law, Representation Theory +3

The Subsemigroup Generated By the Idempotents of a Full Transformation Semigroup

John Howie · Journal of the London Mathematical Society · 1966 · 239 citations

Natural Sciences, Organizational Behavior, Representation Theory +4

On products of idempotent matrices

J. A. Erdös · Glasgow Mathematical Journal · 1967 · 154 citations · Full text

Natural Sciences, Mathematics, Algebra +10