6,145 reputation
623
bio website mrcactu5.herokuapp.com/…
location New York, NY
age 30
visits member for 3 years, 11 months
seen 21 hours ago

Data Scientist @ Explorer Media


Jun
20
comment on automorphisms groups a finite 2-group
@elham a group automorphism should show where both generators go, $a \mapsto ?, b \mapsto ?$ $$ . $$ how do you know $G$ is finite?
Jun
18
comment what are the “points” of the scheme $\mathbb{Z}_8[x] /(x^2 + 7)$
Can you explain from this picture of $\mathrm{Spec}$ why $x^2 + 7$ should have extra roots?
Jun
18
comment what are the “points” of the scheme $\mathbb{Z}_8[x] /(x^2 + 7)$
@zcn I think I meant $(0)$ is prime -- I remember something the effect that a scheme basically has "one point". Thank you.
Jun
18
revised what are the “points” of the scheme $\mathbb{Z}_8[x] /(x^2 + 7)$
added 215 characters in body
Jun
18
accepted what are the “points” of the scheme $\mathbb{Z}_8[x] /(x^2 + 7)$
Jun
18
comment what are the “points” of the scheme $\mathbb{Z}_8[x] /(x^2 + 7)$
@zcn $x^2 - 1 = (x+1)(x-1)$ is $0$ in my ring $\mathbb{Z}_8[x]/(x^2 + 7)$ by definition.
Jun
18
reviewed Reject How to create a vector field whose Curl and Divergence are zero at any point?
Jun
18
comment what are the “points” of the scheme $\mathbb{Z}_8[x] /(x^2 + 7)$
@JyrkiLahtonen The "primes" would be $(1), (x+c)$ where $c \in \{ 1,3,5,7\}$. The nilpotent $(2)$ acts like an infinitesimal, but $(x\pm1)$ is a zero divisor, not nilpotent..
Jun
18
revised Studying $\operatorname{Spec}\mathbb{Z}[x]$, $\operatorname{Spec}\mathbb{R}[x]$, and $\operatorname{Spec}\mathbb{C}[x,y]$.
broken link
Jun
18
asked what are the “points” of the scheme $\mathbb{Z}_8[x] /(x^2 + 7)$
Jun
18
comment Question about English sentences in statistics?
the guy has a degree in math not english :-)
Jun
18
answered Can you also conclude also that $X^{\phi{(n)}}-[1]=\prod_{[a] \epsilon (Z /_n Z)^x}(X-[a])$?
Jun
17
answered Prove That the Second Moment is Minimized with a Circle Packing
Jun
17
awarded  Enthusiast
Jun
16
reviewed Approve Centre of $GL(n,\mathbb{R})$
Jun
15
comment Cauchy's generalized Mean Value Theorem: Intution
math.stackexchange.com/questions/114694/…
Jun
15
asked Log concavity of binomial coefficients: $ \binom{n}{k}^2 \geq \binom{n}{k-1}\binom{n}{k+1} $
Jun
15
comment Does the shift operator on $\ell^2(\mathbb{Z})$ have a logarithm?
Does it meatter that shift map $S$ is not compact?
Jun
14
comment $\int_0^1\frac{f^2(t)}{t(1-t)}dt \leq \frac{1}{2}\int_0^1 f'(t)^2 dt$
$\displaystyle \lim_{t\to 0^+} \frac{f(t)}{t} = \lim_{t\to 0^+}\frac{f(t)-f(0)}{t-0} = f'(0) $ this number exists since $f \in C^1([0,1])$.
Jun
14
comment Airy differential equation and Galois group
One of Lie’s motivations for studying Lie groups was to extend Galois theory to differential equations, by studying the symmetry groups of differential equations. notes