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Why does the novel begin with such a detailed introduction to Robert Cohn?
Robert is the protagonist of the novel, and Jake is the antagonist.
Robert is a foil that allows Hemingway to emphasize elements of Jake's character.
As Jake’s primary ally, Robert serves an important role in the development of the plot.
Because Jake confides in Robert, Hemingway is able to use him as a method of revealing Jake’s inner thoughts.
It is important for the reader to understand Robert’s childhood traumas so that his later behavior makes sense.