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Aleksei Kulikov's user avatar
Aleksei Kulikov's user avatar
Aleksei Kulikov
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36
Can the product of two disjoint subsets of numbers like 7, 77, 777, ... be equal?
Jan 7
question
28
Number of real roots of a polynomial
Feb 1, 2017
answer
28
Does a function from $\mathbb R^2$ to $\mathbb R$ which sums to 0 on the corners of any unit square have to vanish everywhere?
Mar 6
answer
23
Is the sum of the reciprocals of the products of pairs of coprime positive integers and their sums equal to 2?
Nov 11, 2023
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16
Bounding a Fourier coefficient of a non-negative periodic function in terms of its $L^2$-norm
Mar 11, 2020
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14
On the finite sum of reciprocal Fibonacci sequences
Aug 5, 2023
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14
XOR-free sets: Maximum density?
Feb 24, 2019
answer
13
How many points should we remove so that there are no n points lying on a line?
Jun 9, 2023
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13
Lower bound $\int_0^1 \frac{|f'(x)|^2}{f} \,\mathrm{d} x$ by $\int_0^1 |f-1|^2\, \mathrm{d} x$
Apr 4, 2023
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13
Evaluating the infinite product $\prod_{k\geq 2}(1-\frac{1}{k^3})$
Mar 25
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Minimal order of $\bigg|\sum\limits_{k=1}^na^3_k\bigg|$ given $\bigg|\sum\limits_{k=1}^na_k\bigg|\geq\sqrt{n}$