Counterexample for the monotonicity of Lebesgue dimension?
45485
Dimension of a subset
78256
Finite additivity in outer measure
65888
A counterexample to theorem about orthogonal projection
104744
Can sets of cardinality $\aleph_1$ have nonzero measure?
131664
Why is any Lebesgue-Stieltjes measure on $(\mathbb{R},\mathcal{B}_\mathbb{R})$ not complete?
98580
Lebesgue-measurable sets requiring the Axiom of Choice to construct
55019
Lebesgue density theorem in the line
132595
$\sup_{0 \leq M \leq I_{\mathcal{H}_1}} \frac{\operatorname{Tr}[\rho M]}{\operatorname{Tr}[\sigma M]}$ satisfies Data Processing Inequality
3663
Finding counterexamples in elementary set theory.
138055
If $A$ has a positive Lebesgue measure then there exist subsets which are not measurable
82236
Extension of the Lebesgue measurable sets
14489
Showing that a sequence is monotone and thus convergent
152563
Set of discontinuity of monotone function is countable
25874
Showing that a certain map is not flat by explicit counterexample
19773
Is finite additivity a property of the Lebesegue outer measure?
136795
A non-measurable set of given outer measure
62793
$\mathbb{R}$ with the lower limit topology is not second-countable