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1 Kryloff, N., and Bogoliuboff, N.; Introduction d la Mecanique non lineaire, Kieff, 1937; also free English translation by S. Lefschetz, Princeton University Press, 1943. 2 Poincar6, H., "Sur l'equilibre d'une masse fluide," Acta Mathematica, Vol. 7; Figures d'equilibre d'une masse fluide, Paris, 1903. Liapounoff, A., Probl6me gen6ral de la stabilit6 du mouvement. Ann. de la Fac, d. Sc. de Toulouse, 9, 203 (1907). Andronow, A., and Chaikin, S., Theory of Oscillations, Moscow, 1937.

First Proof that the Mersenne Number M 157 Is Composite

First Proof that the Mersenne Number M ₁₅₇ Is Composite