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### Questions (62)

 4 How to understand Weyl chambers? 3 Every group element is a product of elements in certain subsets 3 Roots of the equation $x^2+1=0$ in $\Bbb Z/p^{n}\Bbb Z$ 3 $R=\{ m+nr\sqrt{2} \mid m,n \in \Bbb Z \}$ and $I_{a,b}=\{ ma+n(b+r\sqrt{2}) \mid m,n \in \Bbb Z \}$ 3 If $K \subset \mathbb{Q}(\sqrt[p]{2},\sqrt[q]{2})$ and $[K : \mathbb{Q}]=p$ then $K= \mathbb{Q}(\sqrt[p]{2})$

### Reputation (427)

 +5 Equivalent definitions of continuity at a point +5 $M$ is normal if $Z\not\subseteq M$ +5 Roots of the equation $x^2+1=0$ in $\Bbb Z/p^{n}\Bbb Z$ +5 Determining the number of subgroups of $\Bbb Z_{14} \oplus \Bbb Z_{6}$

 1 Convex cone question. 0 Roots of height 1 are necessarily simple.

### Tags (72)

 1 convex-analysis × 2 0 root-systems × 8 1 vector-spaces × 2 0 group-theory × 7 1 vector-analysis 0 ring-theory × 6 1 real-analysis 0 lie-algebras × 6 0 abstract-algebra × 10 0 linear-algebra × 6

### Accounts (3)

 Mathematics 427 rep 513 MathOverflow 170 rep 5 TeX - LaTeX 155 rep 4

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