Sanchez

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I really appreciate it when you take time to answer my questions. Thanks!

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102 Answers

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11	When is $(p - 1)! + 1$ a power of $p$?
10	Prove that for any $x \in \mathbb N$ such that $x<n!$ is the sum of at most $n$ distinct divisors of $n!$
10	Find three polynomials whose squares sum up to $x^4 + y^4 + x^2 + y^2$
8	Given $a+b+c=0$, simplify the following.
7	Let $a_{i} \in\mathbb{R}$ ($i=1,2,\dots,n$), and $f(x)=\sum_{i=0}^{n}a_{i}x^i$ such that if $\|x\|\leqslant 1$, then $\|f(x)\|\leqslant 1$. Prove that:

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4,313 Reputation

+10	Let $a_{i} \in\mathbb{R}$ ($i=1,2,\dots,n$), and $f(x)=\sum_{i=0}^{n}a_{i}x^i$ such that if $\|x\|\leqslant 1$, then $\|f(x)\|\leqslant 1$. Prove that:
+10	Prove That $x=y=z$
+45	Planes, quadric surfaces and then …?
+5	$H^1$ of $\Bbb Z$ as a trivial $G$-module is the abelianization of $G$

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13 Questions

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21	Examples of mathematicians who lost interest in Math and got interested again?
6	$H^1$ of $\Bbb Z$ as a trivial $G$-module is the abelianization of $G$ [duplicate]
6	Covering $\mathbb{R}^n$ by countably many lower dimensional pieces?
5	Analytically continue a function with Euler product
4	How to think about cup product in group cohomology?

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84 Tags

58 inequality × 19	27 homework × 8
46 algebraic-geometry × 20	20 elementary-number-theory × 5
32 commutative-algebra × 11	18 polynomials × 3
31 number-theory × 14	11 differential-geometry × 8
28 linear-algebra × 7	11 analysis × 4

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4 Accounts

$Mathematics Stack Exchange$	Mathematics	4,313 rep	1722
	Cognitive Sciences	126 rep	2
	Super User	106 rep	2
$TeX - LaTeX Stack Exchange$	TeX - LaTeX	101 rep

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Caucus	Revival
Yearling	Civic Duty
Quorum	Enlightened × 2

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