Semigroup Forum

, Volume 30, Issue 1, pp 177–193

Free groups and semigroups in βN

  • Neil Hindman
  • John Pym
Research Article

DOI: 10.1007/BF02573448

Cite this article as:
Hindman, N. & Pym, J. Semigroup Forum (1984) 30: 177. doi:10.1007/BF02573448

Copyright information

© Springer-Verlag New York Inc. 1984

Authors and Affiliations

  • Neil Hindman
    • 1
    • 2
  • John Pym
    • 1
    • 2
  1. 1.Howard UniversityWashington, DC
  2. 2.The UniversitySheffield