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Questions
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What is the oldest open problem in mathematics ?

may 29 11 at 21:08 Dylan Thurston 3,554●10●22

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Rational numbers with dense orbits in [0,1] under iteration by f(x)=4x(1-x)

jun 9 10 at 14:52 coudy 4,483●14●28

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sets with positive Lebesgue measure boundary

may 26 10 at 12:58 Andrey Rekalo 14k●1●34●69

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a.e. convergence of the powers of an operator built from rotations

jun 29 10 at 18:01 Helge 2,266●7●13

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Minimal elements of minimal R^k actions

jul 7 10 at 19:38 coudy 4,483●14●28

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topologically mixing subshifts without ergodic measures

jun 8 10 at 17:07 Ian Morris 1,961●8●17

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Convergence of the sum of squares of averages of a sequence whose sum of squares is convergent

jun 14 10 at 23:14 Gjergji Zaimi 37.8k●2●75●151

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Examples of $G_\delta$ sets

mar 4 11 at 14:53 Julián Aguirre 1,191●5●11