what is log for em does conditional expectation require multiple variables what is em what is the condition of the condition of em? if you find y is a single value what is the equivalent to this what is the log y why do we add iid variables in conditional expectation where is the value of the variable $y in em derivation why can i sum over the iid variable in conditional expectation? what is the function of iid variable in em what is the sum of a variable in em? where does em come from which conditional expectation cannot be used for summation? if a variable in a log is a conditional expectation, why can't i use sum over the iid variable which variable can be summarised in an em log? which conditional expectation is used for em how does em work? em deriving definition why can I add an iid variable to em when to use enum in em