Is the perimeter of a nested convex set smaller than the perimeter of containing sets?
53132
A convex subset of a set has 'smaller' boundary than the set?
72659
How can we define convexity in one dimension?
43024
Well-ordered sets, properties of an element that is not largest in the set
25738
Jensen's Inequality implies convexity?
24888
What is the smallest convex set includes all smooth unit curves?
116382
Showing convexity of a function with the restriction over an arbitrary line
54791
Is it true or false that $\lvert P([0, 1]) \setminus P((0, 1)) \rvert > \lvert P(\mathbb{N}) \rvert$
22558
Vitali-type set with given outer measure
101179
Partition of a set and Hall's theorem
110485
Nested sequence of non-empty compact subsets - intersection differs from empty set
69235
padded boundary of convex hull
30079
Is for open connected $U$ the set $U_\varepsilon$ for small $\varepsilon$ connected?
35043
Cardinality of a set A is strictly less than the cardinality of the power set of A
79531
Distance between sets with one closed set and one compact set
76192
Intersection of volumes defined by inequalities
134310
Minkowski sum of a positive Lebesgue measure set and $\mathbb{Q}$.
22804
Interpretation of limsup-liminf of sets