14,992 reputation
11940
bio website math.brown.edu/~lubinj
location Minnesota
age 78
visits member for 3 years, 2 months
seen 6 hours ago

Aged mathematician


Dec
15
answered If $\zeta= e^{2\pi i/7}$ then $2\cos(2\pi/7) = (\zeta+ \zeta^6)$. Find a cubic polynomial satisfied by $\zeta + \zeta^6$.
Dec
14
answered Factoring $x^{3}-6\in \mathbb{F}_{p}[x]$ when $p\equiv 1$ mod $3$.
Dec
12
answered Cyclotomic extension of $\mathbb{F}_p((T))$
Dec
8
answered Another way to prove that if n$^{th}$-degree polynomial $r(z)$ is zero at $n+1$ points in the plane, $r(z)\equiv 0$?
Dec
5
answered Characteristic of a Ring not making sense.
Dec
5
answered What is the process of expanding quadratic equation
Dec
4
answered Composition of Inverse Functions
Dec
4
answered Find all irreducible monic polynomials of degree 3 in $\mathbb Z/3\mathbb Z[x].$
Dec
2
answered how to construct an hyperbolic (8,3) tiling
Dec
2
answered Compute $z^3 = -26 -18i$
Dec
1
answered Which $p$-adic fields contain these numbers?
Nov
30
answered Visualizing Balls in Ultrametric Spaces
Nov
29
answered Minimal Polynomial of $a +b\sqrt{2}$ as a function of a, b ∈ $\mathbb Q$
Nov
29
answered Determine the minimal polynomial of $\sqrt 3+\sqrt 5$
Nov
28
answered Let $y^2 = x^3 + Ax + B$ be a curve and $y = m(x - x_1) + y_1$ tangent at $x_1$. Why is $x_1$ then a double root?
Nov
26
answered Find the splitting field of a polynomial
Nov
26
answered $t$-adic topology (on $\mathbb F_p(1/t)$)
Nov
26
answered Prove Using Definition that the Sequence $\frac{n+1}{\sqrt{n}+2}$ Diverges to Infinity
Nov
21
answered Laurent series for $f(z)= \frac{1}{ (z-i)(z+2i)}$
Nov
19
answered $\sum_{\zeta^p=1}(\zeta-1)^n$