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Alternating sum of square roots of binomial coefficients

mar 11 12 at 18:59 Mark Wildon 2,035●1●9●15

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Reference request: a locally cyclic group is isomorphic to a section of the rational numbers

sep 30 11 at 17:07 Mark Sapir 27.6k●2●57●118

 
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Orbits of the projective special linear group on $\mathbf{Q} \cup \{\infty\}$

jul 31 at 13:50 Yves Cornulier 2,936●1●6●11