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16h
answered Do prime numbers have prime factors?
18h
comment Closed form of $\sum_{n=1}^\infty (-1)^n\frac{\sin(n\theta)}{n^3}$ for $\theta\in (-\pi,\pi)$
WA finds a non-elementary solution.
19h
comment Number Theory or Abstract Algebra first?
You'll probably seem some Number Theory in the Abstract Algebra course, but not necessarily the other way around (though it is common too). Perhaps a look at the suggested books for the courses will help you decide.
Jul
3
answered In need of a group theory textbook.
Jul
3
answered Subgroup proof verification.
Jul
3
answered Nontrivial entire $f(z)$ never equal to $0$
Jul
3
answered Pronuntiation of the symbol $\varnothing$ of the empty set
Jul
3
revised Find a prime $p$ such that $f(x)=x^6 - x^3 +1$ factors in to linear factors in $\mathbb{F}_p[x]$
added 286 characters in body
Jul
3
comment Find a prime $p$ such that $f(x)=x^6 - x^3 +1$ factors in to linear factors in $\mathbb{F}_p[x]$
Well, it's mod $18$ in the exponent, because $( \mathbb{F}_p )^x \cong C_{18}$.
Jul
3
answered Find a prime $p$ such that $f(x)=x^6 - x^3 +1$ factors in to linear factors in $\mathbb{F}_p[x]$
Jul
2
comment A question on convex hull
This is exactly what Theo Bendit suggested. I only saw his comment now.
Jul
2
answered A question on convex hull
Jul
2
comment Start and end point of a rotated ellipse
The SVG specification seems relevant: w3.org/TR/SVG/paths.html#PathDataEllipticalArcCommands.
Jul
2
answered What's a group whose group of automorphisms is non-abelian?
Jul
2
comment system of modular equations.
@N.F.Taussig, yes, I did, thanks.
Jul
2
revised system of modular equations.
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Jul
2
revised Example of subgroup of $\mathbb Q$ which is not finitely generated
added 119 characters in body
Jul
2
comment Example of subgroup of $\mathbb Q$ which is not finitely generated
No, it's the set of all fractions whose denominators are a power of $2$. Your $\{a + b/2 : a, b \in \mathbb Z\}$ is finitely generated (by $1$ and $1/2$, and so by $1/2$ alone).
Jul
2
answered Example of subgroup of $\mathbb Q$ which is not finitely generated
Jul
2
answered system of modular equations.