On existence of the identity element in a semigroup
S. Lajos (1965)
Matematički Vesnik
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Displaying similar documents to “On non-Hopfian groups of fractions”
On existence of the identity element in a semigroup
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Wreath product of a semigroup and a Γ-semigroup
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Let S = {a,b,c,...} and Γ = {α,β,γ,...} be two nonempty sets. S is called a Γ -semigroup if aαb ∈ S, for all α ∈ Γ and a,b ∈ S and (aαb)βc = aα(bβc), for all a,b,c ∈ S and for all α,β ∈ Γ. In this paper we study the semidirect product of a semigroup and a Γ-semigroup. We also introduce the notion of wreath product of a semigroup and a Γ-semigroup and investigate some interesting properties of this product.