What do the functions in the picture mean?

Question

I'm a freelancer coder and I was coding some equations. But for the equation below, I don't know what they mean? can anybody help me so I can model it?

$$\large\delta^*=\arg\{\underset{\delta}{\max}E[B(WA)-L(F,D)]\}$$

Answer 1

Even though it is not immediately apparent, the expression $E[B(WA)-L(F,D)]$ seems to be a function of $\delta$. Now $\max_\delta$ describes the maximal "output" that this expression can attain among all possible choices of $\delta$, and $\operatorname{arg}$ describes an "input" that produces this maximal "output". In other words, $\delta^*$ is a maximizer of $E[B(WA)-L(F,D)]$.