$E(\operatorname{variable})$ is the expected value of a variable. $E(\operatorname{variable}|\operatorname{event})$ is the expected value of the variable conditioned on event. But what does E(variable,event) mean?
I thought it meant something like $E(\operatorname{variable}|\operatorname{event})P(\operatorname{event})$ but then I saw it written in a book where the event was certain, so the expression $E(\operatorname{variable}|\operatorname{event})P(\operatorname{event})$ would be redundant.
Thanks in advance.