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Classroom NotesFulton, Curtis M.; Newman, D. J.; Chatterjea, S. K.; Cullen, C. G.; Sonner, J.; Pennington, W. B.; Barrett, Louis C.; Wilde, Carroll; Pursell, Lyle E.; Sklar, Abe; DeSua, Frank C.; Firey, William J.; Elder, A. E. · The American Mathematical Monthly · 1960