As of May 31, 2023, we have updated our Code of Conduct.

shintuku

Member for 3 years, 3 months
Last seen this week

Summary

Reputation

262

top 12% this quarter

718
424
130

Sep
Dec
Mar
Jun

Top tag

geometry

Next privilege

500 Rep.

Access review queues

Badges

5

16

Newest

Yearling

Next badge

270/300

Civic Duty

Questions

View all 107 questions

Score Activity Newest Views

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

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

4

Can you graph $y^{4}x^{3}+x^{4}-y=0$ without a computer?

Apr 27

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

3

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

Answers

View all 6 answers

Score Activity Newest

2

Synthetic geometry: if a line L does not pass through the centre $q$ of $K$, then inversion in $K$ maps $L$ to a circle that passes through $q$

Apr 21, 2021

1

Prove an ideal has at least one generator.

May 31

0

Sleeker way to get $n>\delta\to\epsilon>|s_n-L|$ from $\inf\{|s_n|\}+\epsilon >|s_n| \geq \inf\{|s_n|\}$ and $|s_n| > |s_{n + 1}|$

Jul 21, 2021

0

Formally, how do I obtain $\lim\limits_{t\to 0}\frac{f(\vec a+t\vec v)-f(\vec a)-f'(\vec a)t\vec v}{|t|}=0$ from the definition of differentiability?

Oct 30, 2021

0

Problem with: if $V$ is subspace of $\mathbb{R}^1$ and $\vec v \in V$ is nonzero, then any vector $\vec x \in \mathbb{R}^1$ can be written $k \vec v$

Mar 17, 2020

Tags

View all 84 tags

geometry

2

Score

14

posts

euclidean-geometry

2

Score

8

posts

complex-analysis

2

Score

4

posts

abstract-algebra

1

Score

7

posts

group-theory

1

Score

4

posts

Reputation

top 12% this quarter

+20

Is the localization at a prime ideal of any polynomial ring always a valuation ring?

+10

Is the localization of a polynomial ring at a prime ideal a valuation ring if and only if the prime ideal is principal?

+10

Prove an ideal has at least one generator.

+10

Prove an ideal has at least one generator.

Badges

View all badges

This user doesn’t have any gold badges yet.

5

silver badges

Outspoken

Oct 19, 2021
Inquisitive

Oct 3, 2021
Enthusiast

May 31, 2021

16

bronze badges

Talkative

Apr 26, 2021
Cleanup

Oct 14, 2021
Benefactor

Apr 28, 2021

Accounts

View all 29 accounts

262
5
16

223
1
6

German Language

191
6

Russian Language

153
4

English Language & Usage

143
4

Active bounties (0)

Active Offered Earned

This user has no active bounties

Votes cast

262

upvotes

8

downvotes

53

question votes

217

answer votes

4

this month

1

this week

1

today