New posts in lebesgue-measure

Subset of plane with measure $1$ in all lines

Let $\alpha \in (0,1)$. Find a Borel subset $E$ of $[-1,1]$ s.t. $\lim_{r\to 0^{+}} \frac{m(E\cap [-r,r])}{2r}=\alpha.$

Interplay of Hausdorff metric and Lebesgue measure

Let $f : \mathbb{R} \to \mathbb{R}$ be measurable and let $Z = {\{x : f'(x)=0}\}$. Prove that $λ(f(Z)) = 0$.

Does the graph of a measurable function always have zero measure?

Set $E\subset \mathbb{R}^n$ of positive Lebesgue measure such that the Lebesgue measure of its boundary is zero

Non measurable subset of a positive measure set

$E$ measurable set and $m(E\cap I)\le \frac{1}{2}m(I)$ for any open interval, prove $m(E) =0$

Composition of measurable & continuous functions, is it measurable?

Equivalent ideas of absolute continuity of measures

If $f'(x)>0$ on $E$ , where $m(E)>0,$ then $m(f(E))>0$

$f$ a real, continuous function, is it measurable?

How to prove that if $f$ is continuous a.e., then it is measurable.

Proving the *Caratheodory Criterion* for *Lebesgue Measurability*

Finite additivity in outer measure

Prove that Lebesgue measurable set is the union of a Borel measurable set and a set of Lebesgue measure zero

The Lebesgue measure of zero set of a polynomial function is zero

Prove that $f$ is integrable if and only if $\sum^\infty_{n=1} \mu(\{x \in X : f(x) \ge n\}) < \infty$

Why is Lebesgue-Stieltjes a generalization of Riemann-Stieltjes? Moreover, is there an example where Lebesgue-Stieltjes is useful

Show that if the integral of function with compact support on straight line is zero, then $f$ is zero almost everywhere