Mathematics
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shintuku
  • Member for 2 years, 5 months
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All Questions Answers
Score Newest
question
4
Synthetic geometry: stereographic projections of $\mathbb{C}$ on Riemann sphere $\Sigma$ are inversions in sphere $K$ centered on $\infty$ of $\Sigma$
Apr 21, 2021
question
4
Metric spaces: equivalence of neighborhood definition of continuity with usual one. Don't we need a constraint asserting existence of neighborhoods?
Aug 22, 2021
question
4
Can we use the Lambert W solution $y=-3W(K_2x^{-4/3})$ instead of $y =-3W(\frac 1 3\sqrt[3]{-\frac{K_1}{x^4}})$ if we choose an appropriate constant?
Oct 24, 2021
question
3
Proof verification: if $a_n, b_n>0$ and $\lim\limits_{n \to\infty} \frac{a_n}{b_n}=L_1$ with $L_1>0$, then if $\sum a_n$ converges, so does $\sum b_n$
Oct 20, 2021
question
3
Least squares: can't find why $SSR = a_1 \sum Y_i + b_1 \sum Y_i X_i - n\overline Y^2$. Would anyone have references?
Apr 23
question
3
Proof technique: Given vector subspaces $U$ and $W$, prove that $U + W = \{ ...\}$
May 17, 2021
question
3
Multiplication in synthetic geometry (example using geometrical circle inversion theorem)
Mar 30, 2021
question
3
In general, for a graph of solutions to a differential equation is there a 3D graph s.t. these curves are its level curves? Then, what's this graph?
Jul 23, 2021
question
3
Prove$\lim \limits_{x \to \infty} e^{-Px}\int Q'(x)\frac{e^{Px}}{P} \ dx$ exists and find it, for constant $P>0$ and $Q'(x) \to 0$ as $x \to \infty$
Jul 26, 2021
question
3
Reference request: let $f:\mathbb{R}\to\mathbb{N}$ be onto. In ZF no $g:\mathbb{N}\to\mathbb{R}$ s.t. $f(g(b))=b$ for all $b\in\mathbb{N}$ exists
Aug 20, 2021
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6
Python pandas creating an uneven multiindex
5
How does the meaning of "не мог/смог сдержа́ть/сде́рживать" vary according to the aspect used?
5
Dictionary indicates 'zu jds. Gunsten' and gives the example 'zu meinen/Ihren Gunsten'; generally can 'jds' be substituted by meinen/deinen/seinen/…?

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