14,577 reputation
11938
bio website math.brown.edu/~lubinj
location Minnesota
age 78
visits member for 3 years, 1 month
seen 54 mins ago

Aged mathematician


12h
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?
2d
answered Find the splitting field of a polynomial
2d
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 $\sum_{\zeta^p=1}(\zeta-1)^n$
Nov
17
answered Proving that the Gaussian integers have no zero divisors
Nov
15
answered Find all the values of $w$ ∈ C that satisfy the equation.
Nov
14
answered How do you find the imaginary roots of a fourth degree polynomial that cannot be simplified?
Nov
11
answered How would I calculate the area of a rectangle on a sphere using vertical and horizontal angles?
Nov
7
answered Is there a rationality-preserving order isomorphism between $\mathbb{Q}$ and two disjoint open intervals?
Nov
5
answered Writing clear proofs involving multiple theorems and conditions
Nov
2
answered If $H$ is a subgroup of $G$ and $a, b \in G$, how is $aH=bH$?
Oct
29
answered How do you solve a logarithm with a non-integer base?
Oct
29
answered Solution of Pell equation over field of p-adic numbers
Oct
29
answered Calculate the power series
Oct
28
answered Rules for Calculating Modulo
Oct
27
answered Use of the concept of subgroup vs field extension
Oct
25
answered If $R$ is a local ring, is $R[[x]]$ (the ring of formal power series) also a local ring?
Oct
22
answered Function composition: $f^{653}(56)=?$