Free paratopological groups

• Main Author: Ali Sayed Elfard
• Format: Article
• Language: English
• Published: Universitat Politècnica de València 2015-10-01
• Series: Applied General Topology
• Subjects: Topological group; paratopological group; free paratopological group; Alexandroff space; partition space, neighborhood base at the identity.
• Online Access: http://polipapers.upv.es/index.php/AGT/article/view/1874
• ISSN: 1576-9402; 1989-4147

Let FP(X) be the free paratopological group on a topological space X in the sense of Markov. In this paper, we study the group FP(X) on a $P_\alpha$-space $X$ where $\alpha$ is an infinite cardinal and then we prove that the group FP(X) is an Alexandroff space if X is an Alexandroff space. Moreover, we introduce a~neighborhood base at the identity of the group FP(X) when the space X is Alexandroff and then we give some properties of this neighborhood base. As applications of these, we prove that the group FP(X) is T_0 if X is T_0, we characterize the spaces X for which the group FP(X) is a topological group and then we give a class of spaces $X$ for which the group FP(X) has the inductive limit property.