I would say that it is third person limited (the narrator only knowing the thoughts and feelings of a single character, in this case, TS Garp.)
However, Irving complicates matters by toggling between two third person limited points of view: that of Garp, (" Garp found that he could forget her; lust,...
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I would say that it is third person limited (the narrator only knowing the thoughts and feelings of a single character, in this case, TS Garp.)
However, Irving complicates matters by toggling between two third person limited points of view: that of Garp, ("Garp found that he could forget her; lust, as his mother called it, was tricky that way") and that of his "official biographer" ("In the world according to Garp, we are all terminal cases.")