List questions from sumset

Published on 23 Feb 2026 - 4:19

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The sum of a set $A$ with the empty set, $\varnothing$

Published on 23 Feb 2026 - 4:22

80

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Is the sum of a closed unit ball and a closed set itself closed?

Published on 09 Apr 2026 - 13:36

110

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Is this Minkowski Sum result correct?

Published on 27 Mar 2026 - 12:57

14

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Convexity of minkowski space when two triangles collide

Published on 09 Apr 2026 - 14:45

101

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How many subsets $S$ of integer interval $[0,n]$ such that $n, n-1 \not \in S+S$?

Published on 09 Apr 2026 - 10:05

56

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Whether $\sup(\sum\limits_{i=1}^{\infty}X_i)$ is equal to $\sum\limits_{i=1}^{\infty}(\sup X_i)$

Published on 23 Feb 2026 - 4:20

65

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What is the maximum range of a convex finite additive 2-basis of cardinality k?

Published on 09 Apr 2026 - 10:05

41

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Affine Combinations and Span

Published on 10 Apr 2026 - 15:40

33

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A Question on the Brunn-Minkowski inequality

Published on 23 Feb 2026 - 4:17

365

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To show sum of two sets is closed in R^2

Published on 23 Feb 2026 - 4:22

66

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Proving if $|A|\ge 4 \vee |A|\le 2$ then $|A+A|\neq 4$ with direct, contradiction and contraposition

Published on 23 Feb 2026 - 4:24

224

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If the sum of sets is open then one of them is open?

Published on 23 Feb 2026 - 4:24

834

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Two sets $X,Y \subset [0,1]$ such that $X+Y=[0,2]$

Published on 23 Feb 2026 - 4:19

304

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What are the bounds (upper and lower) for $|A+A|$?

Published on 23 Feb 2026 - 4:19

List Question

Limit measuring failure of sum-set cancellability

The sum of a set $A$ with the empty set, $\varnothing$

Is the sum of a closed unit ball and a closed set itself closed?

Is this Minkowski Sum result correct?

Convexity of minkowski space when two triangles collide

How many subsets $S$ of integer interval $[0,n]$ such that $n, n-1 \not \in S+S$?

Whether $\sup(\sum\limits_{i=1}^{\infty}X_i)$ is equal to $\sum\limits_{i=1}^{\infty}(\sup X_i)$

What is the maximum range of a convex finite additive 2-basis of cardinality k?

Affine Combinations and Span

A Question on the Brunn-Minkowski inequality

To show sum of two sets is closed in R^2

Proving if $|A|\ge 4 \vee |A|\le 2$ then $|A+A|\neq 4$ with direct, contradiction and contraposition

If the sum of sets is open then one of them is open?

Two sets $X,Y \subset [0,1]$ such that $X+Y=[0,2]$

What are the bounds (upper and lower) for $|A+A|$?

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