Top network posts

• 19 ${\rm Aut}(G)$ is cyclic $\implies G$ is abelian
• 18 Why is $\mathbb{Z}[X]$ not a euclidean domain? What goes wrong with the degree function?
• 16 Is there a real number which comes just after a particular real number?
• 12 How to prove that at least two of the numbers $x,y,z$ are within $\frac{1}{2}$ unit from one another?
• 11 Relation between determinant and matrix rank
• 10 Any prime is irreducible
• 9 Why does $\{1 \dots 9\}$ behave like this under multiplication mod $10$?
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