Skip to main content
Mathematics
irchans's user avatar
irchans's user avatar
irchans's user avatar
irchans
  • Member for 7 years, 11 months
  • Last seen more than a month ago
  • State College, PA, USA
Profile Activity
Stats
1,965
reputation
33k
reached
97
answers
8
questions
Communities
View all
About

I used to teach math at Penn State. I'm into Machine Learning, Games, Programming, and Astronomy.

Badges
View all badges
1
gold badge
10
silver badges
18
bronze badges
Top tags
View all tags
31
Score
5
Posts
5
Posts %
17
Score
14
Posts
13
Posts %
12
Score
6
Posts
6
Posts %
11
Score
7
Posts
7
Posts %
10
Score
9
Posts
9
Posts %
8
Score
13
Posts
12
Posts %
Top posts
View all questions and answers
answer
25
Wrong solution for solving $ 3x^2 - 6x - 9 = 0 $
Oct 18, 2018
answer
8
Derivation of D-dimensional Laplacian in spherical coordinates
Aug 19, 2019
answer
7
About the definition of curvature
Jan 29, 2019
question
6
Is $\frac{\arccos\left((\sqrt{r}+1)/(r+1/\sqrt{r})\right)}{\pi \left|1-r^{-3/2}\right|}$ analytic at $r=1$?
Jul 8, 2019
answer
4
If the sum of digits of a number is 17 and none of its digits is zero, we called it a ‘good number’. Find the number of 5-digit ‘good number(s)’.
Dec 30, 2023
answer
4
Volume of a solid bounded by cylinders and planes
Dec 14, 2019
answer
4
Does the property $\min_{c \in \mathbb{R}} E[ (X-c)^2] =E[ (X-E[X])^2]$ generalize to the covariance of $(X,Y)$
Aug 2, 2019
answer
4
Integrating second order ODE and finding fixed points
Oct 30, 2018
question
3
Maximal Average Path
Dec 2, 2019
question
3
Independent, unbounded variance, and almost sure convergence
Jun 14, 2022
Top network posts
View all network posts
18
Checking if two line segments intersect
9
When will the last total solar eclipse occur?