Hays, T. E. Semigroups over generalized trees. (English) Zbl 0378.22004 J. Aust. Math. Soc., Ser. A 25, 177-188 (1978). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page MSC: 22A15 Structure of topological semigroups 20M10 General structure theory for semigroups × Cite Format Result Cite Review PDF