math.harvard.edumath.harvard.edu/archive/118r_spring_05/docs/birkhoff.pdf · G D Birkhoff 155 This...

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Transcript of math.harvard.edumath.harvard.edu/archive/118r_spring_05/docs/birkhoff.pdf · G D Birkhoff 155 This...

George D. Birkhoff: On the periodic motions of dynamical systems, Acta Mathematica, 50, p 359-379, 1927