Proceedings of the American Mathematical Society, Vol. 110, No. 1 (Sep., 1990), pp. 263-268 (6 pages) Two fixed points of a topological dynamical system are said to be of the same type if there exists ...
In 1885, King Oscar II of Sweden announced a public challenge consisting of four mathematical problems. The French polymath Henri Poincaré focused on one related to the motion of celestial bodies, the ...
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