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# Questions

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### Examples of $G_\delta$ sets

mar 4 11 at 14:53 Julián Aguirre 1,191511

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### Minimal elements of minimal R^k actions

jul 7 10 at 19:38 coudy 4,4831428

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333
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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 37.5k272149

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795
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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 4,4831428

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6k
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### What is the oldest open problem in mathematics ?

may 29 11 at 21:08 Dylan Thurston 3,5441022

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533
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### topologically mixing subshifts without ergodic measures

jun 8 10 at 17:07 Ian Morris 1,956717

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### sets with positive Lebesgue measure boundary

may 26 10 at 12:58 Andrey Rekalo 13.9k13468

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