I am currently reading the book Complex Variables by Stephen Fisher, there is one paragraph that was written like this: Establishing the following relation, and they write
$$exp(\bar{z})=\overline{exp(z)}$$
the bar on the right is long and span throughout the whole 3 letters and z, what does this mean? And what do they mean by establishing the relation, do I show that they equal each other? There are no further explanations, they just said left for readers.