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X={x_0,x_1,...} is a list of real numbers. If A,B take turns choosing a_0<a_1<...<b_1<b_0, how can B keep the limit of a_n outside X? #mathPermalink On twitter.com
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If A,B take turns choosing real numbers a_0<a_1<...<b_1<b_0, what sets of real numbers can A ensure convergence of a_n within? #mathOn twitter.com