Título: ★-quasi-pseudometrics on algebraic structures
Autor: He, Shi-Yao; Jin, Ying-Ying; Xie, Li-Hong
Resumen: [EN] In this paper, we introduce some concepts of ★-(quasi)-pseudometric spaces, and give an example which shows that there is a ★-quasi-pseudometric space which is not a quasi-pseudometric space. We also study the conditions under which ★-quasi-pseudometric semitopological groups are paratopological groups or topological groups.