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What is the oldest open problem in mathematics ?

may 29 11 at 21:08 Dylan Thurston 3,544●10●22

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sets with positive Lebesgue measure boundary

may 26 10 at 12:58 Andrey Rekalo 13.9k●1●32●68

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answer
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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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4
answers
482
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Examples of $G_\delta$ sets

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

 

78

Answers
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42
Demystifying complex numbers
16
Making sure that you have comprehended a concept
15
How should one present calculations?
15
Evil Fourier Coefficients
14
Why is the Hahn-Banach thorem so important?
14
Which math paper maximizes the ratio (importance)/(length)?
14
Advice on changing topic for thesis problem
13
Asymptotic approximation of $x^\alpha$ by entire functions
12
Who first proved that there are at least n^(1-ε) primes up to n?
12
Let a function f have all moments zero. What conditions force f to be identically zero?
12
Convergence of Fourier Series of $L^1$ Functions
12
Counterexamples in Algebra?
10
Applications of compactness
10
The harmonic (series) beetle: live illustrations of mathematical theorems
9
Examples of non-abelian groups arising in nature without any natural action
9
Does anyone know an intuitive proof of the Birkhoff ergodic theorem?
8
Papers that debunk common myths in the history of mathematics
8
probability in number theory
7
Can anyone give me a good example of two interestingly different ordinary cohomology theories?
7
A walk on a compact 2D surface embedded in 3-space that never returns home
7
Is there an introduction to probability theory from a structuralist/categorical perspective?
7
Why is Lebesgue integration taught using positive and negative parts of functions?
7
Plotting path between sphere or ellipsoid points?
7
Why does undergraduate discrete math require calculus?
7
Separable sigma-algebra: equivalence of two definitions
7
Sheaf cohomology question
6
Fixed point theorems and equiangular lines
6
Learning Roadmap for Software Engineer
6
When is there a natural Riemannian metric whose measure preserves a self-diffeomorphism?
6
other examples of composition of functions
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