Episode #125 of the Stack Overflow podcast is here. We talk Tilde Club and mechanical keyboards. Listen now
MathBeginner

# 96 Questions

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### Continuous function $f:\mathbb R\to \mathbb R$ such that $f(B)$ is not measurable for a Borel set $B$.

Aug 22 '18 at 0:45 Batominovski 34.9k

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### If $T\in M_{n\times n}(\mathbb R)$ invertible, why is $T^tT$ positive definite?

Aug 21 '18 at 23:25 blub 3,649

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### Why $\|f\|^{q}_{L^q(\mathbb R^d)}\leq \left<f^{q-1},G*f^{q-1}\right>$?

Jan 7 '18 at 17:10 MathBeginner 762

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### Why $\left|\int f f^{q-1}\right|=\|f\|_q^q$?

Jan 6 '18 at 17:42 tristan 2,210

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### Why $\log(\frac{2R}{|x|})\geq C(n-k+1)$ for $2^{k}\leq|x|<2^{k+1}$?

Dec 21 '17 at 9:50 MathBeginner 762
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