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Theorems that are ‘obvious’ but hard to prove

may 4 at 5:37 Burak 21●4

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Simultaneous rational approximation of two reals using their continued fractions

jul 18 11 at 12:45 Henry Cohn 7,419●1●27●41

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Analytic continuation of Dirichlet series with completely multiplicative coefficients of modulus 1

apr 22 10 at 7:29 Michel Balazard 1