Matt N.

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Fundamenta Mathematicae.

Biblioteka Wirtualna Matematyki.

	15,275 reputation	bio	website		visits	member for	2 years, 4 months
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428 Questions

views newest activity votes

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answers

234

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A question regarding finite field extensions

abstract-algebra field-theory

feb 13 '11 at 22:04 Qiaochu Yuan 117k

votes

answer

233

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Proof that $X$ contractible $\iff \forall f:X \rightarrow Y$ : $f \cong const.$

algebraic-topology

mar 10 '11 at 10:41 Aaron Mazel-Gee 3,531

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answer

233

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$(n^2 \alpha \bmod 1)$ is equidistributed in $\mathbb{T}^2$ if $\alpha \in \mathbb{R} \setminus \mathbb{Q}$

homework functional-analysis ergodic-theory equidistribution

nov 11 at 20:05 froggie 4,920

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answers

233

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A question about a weak form of Hilbert's Nullstellensatz

commutative-algebra field-theory

aug 7 at 8:22 BenjaLim 16.7k

votes

answers

233

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Easy Fourier series example: where is my mistake?

functional-analysis fourier-analysis fourier-series

aug 20 at 14:30 Matt N. 15.3k

votes

answer

232

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A question about the tensor product of $\mathbb{Q}$

commutative-algebra modules tensor-products

apr 11 '12 at 10:24 Matt N. 15.3k

votes

answers

232

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Regarding a proof involving geometric series

real-analysis alternative-proof

mar 10 '11 at 19:41 Matt N. 15.3k

votes

answer

230

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A question regarding the notation/definition of homology group

algebraic-topology homology

mar 2 '11 at 12:34 aaron 656

votes

answers

227

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Cellular homology of projective space $\mathbb{R}P^n$

algebraic-topology

aug 25 '11 at 9:06 Matt N. 15.3k

vote

answers

225

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$R/I \otimes_R M \cong M / IM$ [duplicate]

commutative-algebra

jul 27 at 17:35 KReiser 1,620

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answers

225

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Module generated by set $S$

abstract-algebra modules

apr 22 '12 at 8:02 Matt N. 15.3k

votes

answers

224

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$R \otimes_R M \cong M$

commutative-algebra tensor-products

jun 13 '12 at 17:42 Matt N. 15.3k

vote

answer

222

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Converse of “a convergent sequence is Cauchy”

real-analysis metric-spaces

jul 9 at 0:21 Arturo Magidin 158k

votes

answers

221

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Inverse limit by example

commutative-algebra

jul 26 at 8:34 Dylan Moreland 13.4k

votes

answers

221

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A compact operator is bounded

functional-analysis

aug 17 at 14:00 Matt N. 15.3k

votes

answer

220

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What exactly is a Haar measure

functional-analysis measure-theory fourier-analysis

jul 20 at 19:35 paul garrett 10.5k

votes

answer

218

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A question about operator norm

functional-analysis measure-theory

sep 20 at 13:40 Nonliapunov 230

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answers

217

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$\limsup$ and cluster points

real-analysis limsup

jul 4 at 5:21 Matt N. 15.3k

votes

answer

217

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Proof of another Hatcher exercise: homotopy equivalence induces bijection (part II)

algebraic-topology

may 25 '11 at 21:01 Community♦ 1

vote

answer

216

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Definition of tangent space

differential-geometry lie-algebras

sep 19 '11 at 16:48 Neal 6,452

votes

answers

215

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A question about a proof of a weak form of Hilbert's Nullstellensatz

commutative-algebra field-theory

jul 19 at 20:25 Rankeya 4,224

votes

answer

215

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Proof of Hilbert's Nullstellensatz

commutative-algebra

jul 19 at 17:31 Olivier Bégassat 3,649

vote

answers

213

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Proving $|K| = p^n \Rightarrow \operatorname{char}(K) = p$

abstract-algebra field-theory finite-fields

mar 17 '12 at 23:53 Arturo Magidin 158k

votes

answer

211

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Using Bohr sets to locate arithmetic progressions

fourier-analysis additive-combinatorics

apr 1 '12 at 13:30 Matt N. 15.3k

votes

answers

210

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Closure of $\{ (x_n) | x_n = 0 $ for almost all $n \}$

general-topology

apr 6 '11 at 0:04 JSchlather 9,735

votes

answers

210

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Homology groups of unit square with parts removed

algebraic-topology

may 15 '11 at 13:07 Matt N. 15.3k

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answers

210

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Universal properties (again)

abstract-algebra category-theory

apr 18 '12 at 15:40 ineff 2,293

votes

answers

209

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Maximise conditional probability of urns

probability puzzle

feb 10 '11 at 22:15 mjqxxxx 10.2k

votes

answers

208

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Which sets are present in every model of ZF?

set-theory model-theory

may 11 at 13:13 Matt N. 15.3k

votes

answers

207

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Free groups: unique up to unique isomorphism

abstract-algebra category-theory

apr 12 '12 at 19:33 Arturo Magidin 158k