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le duc quang

A child who pick ups a few of small stones everyday hoping for understanding the far away ocean

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35 Prove that the polynomial $(x-1)(x-2)\cdots(x-n) + 1$, $ n\ge1 $, $ n\ne4 $ is irreducible over $\mathbb Z$ Sep 24 '13
19 Prove that the polynomial $(x-1)(x-2)\cdots(x-n) + 1$, $ n\ge1 $, $ n\ne4 $ is irreducible over $\mathbb Z$ Sep 25 '13
12 number of subgroups index $p$ equals number of subgroups order $p$ Jun 7 '13
11 about a ninth-grade geometry problem Jun 1 '16
9 What is the “order” of an automorphism of a group? Sep 1 '12
9 Prove that $(X\times Y)\setminus (A\times B)$ is connected Oct 15 '12
8 Prove that ring contains infinitely many minimal prime ideals Sep 22 '13
8 Proving inner measure equal to outer measure if a set is measurable Jul 3 '15
7 No infinite-dimensional $F$-space has a countable Hamel basis Dec 9 '13
7 Prove that a separable metric space is Lindelöf without proving it is second-countable Dec 29 '13
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