Volume 37 • Number 1 • 2014   • Conditional Multiplication Operators M. R. Jabbarzadeh and M. R. Azimi Abstract. In this paper we provide a necessary and sufficient condition for the conditional multiplication operators to have closed range. Also, some other properties of these type of operators will be investigated. 2010 Mathematics Subject Classification: Primary 47B20; Secondary 47B38 Full text: PDF