List questions from sumset

Published on 22 Feb 2026 - 20:45

8k

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Sum of two subspaces is a subspace

Published on 22 Feb 2026 - 20:57

33

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number of sums in $\mathbb{Z}_{p^r}$ which are coprime to $p^r$

Published on 22 Feb 2026 - 21:02

575

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Is the sum (difference) of Borel set with itself a Borel set?

Published on 22 Feb 2026 - 20:59

72

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If the set $A$ is open in $X$, is the set $\{x+y : x\in A \}$ also open for a given $y \in X$ under any metric space?

Published on 22 Feb 2026 - 21:04

139

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Where can I find this article by I. Ruzsa?

Published on 22 Feb 2026 - 20:58

39

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Retrieve a series knowing all its convergent infinite powersums

Published on 22 Feb 2026 - 20:59

19

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Nr of monthly eggs that have converted to chickens based on nr of months

Published on 22 Feb 2026 - 21:02

488

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Finding elements such that none add to a perfect square

Published on 22 Feb 2026 - 20:58

22

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Lower-bounding the density of 3A in terms of that of 2A

Published on 22 Feb 2026 - 21:02

66

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Prove that if $|A+A| \leq K|A|$ then $2A - 2A$ is a $K^{16}$-approximate group.

Published on 22 Feb 2026 - 21:01

48

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Subsets of $\mathbb Z/n\mathbb Z$ that remain disjoint with themselves under shifts

Published on 22 Feb 2026 - 22:55

131

Views

Subsets of $\mathbb Z/n\mathbb Z$ disjoint with some of its shifts

Published on 22 Feb 2026 - 22:55

83

Views

Coset Progression is Freiman Isomorphic to Bohr Set

Published on 22 Feb 2026 - 22:52

98

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Show that there exists $i\in \lbrace 1, 2, 3 \rbrace $ s.t. there exists $a, b\in A_i $ s.t. $a+b\in B $.

Published on 22 Feb 2026 - 22:55

List Question

Supremum of Sumset (Proof Writing)

Sum of two subspaces is a subspace

number of sums in $\mathbb{Z}_{p^r}$ which are coprime to $p^r$

Is the sum (difference) of Borel set with itself a Borel set?

If the set $A$ is open in $X$, is the set $\{x+y : x\in A \}$ also open for a given $y \in X$ under any metric space?

Where can I find this article by I. Ruzsa?

Retrieve a series knowing all its convergent infinite powersums

Nr of monthly eggs that have converted to chickens based on nr of months

Finding elements such that none add to a perfect square

Lower-bounding the density of 3A in terms of that of 2A

Prove that if $|A+A| \leq K|A|$ then $2A - 2A$ is a $K^{16}$-approximate group.

Subsets of $\mathbb Z/n\mathbb Z$ that remain disjoint with themselves under shifts

Subsets of $\mathbb Z/n\mathbb Z$ disjoint with some of its shifts

Coset Progression is Freiman Isomorphic to Bohr Set

Show that there exists $i\in \lbrace 1, 2, 3 \rbrace $ s.t. there exists $a, b\in A_i $ s.t. $a+b\in B $.

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