User Adrián Barquero - Mathematics Stack Exchange

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	location	College Station, TX
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visits	member for	2 years, 9 months
	seen	13 mins ago
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	6,702 reputation	bio	website		visits	member for	2 years, 9 months
21342 badges		location	College Station, TX		seen	13 mins ago

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Group theory proof of existence of a solution to $x^2\equiv -1\pmod p$ iff $p\equiv 1 \pmod 4$

number-theory algebraic-number-theory

sep 18 '10 at 0:14 Arturo Magidin 158k

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14

votes

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answers

484

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How should I think about what it means for a manifold to be orientable?

dec 31 '10 at 15:10 Jason DeVito 14.2k

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477

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Finite abelian groups as class groups

number-theory algebraic-number-theory

nov 20 '10 at 12:30 Pete L. Clark 44.3k

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votes

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answer

466

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Accessible proof of Carleson's $L^2$ theorem

fourier-analysis fourier-series

nov 28 '10 at 0:52 Zarrax 19.7k

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14

votes

1

answer

446

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How to compute rational or integer points on elliptic curves

reference-request diophantine-equations math-software elliptic-curves faq

oct 15 at 6:31 zyx 10.9k

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4

votes

5

answers

445

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Nontrivial subring with unity different from the whole ring?

abstract-algebra ring-theory

dec 17 at 13:01 Hector Pinedo 128

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votes

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answers

441

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The modular curve X(N)

number-theory modular-arithmetic elliptic-curves

apr 8 '11 at 0:32 Matt E 57.6k

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votes

5

answers

426

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Applications of class number

algebraic-number-theory

aug 4 '10 at 0:19 KCd 5,920

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6

votes

2

answers

422

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Learning roadmap for Class Field Theory and more

number-theory soft-question advice

dec 13 '11 at 5:44 t.b. 43.1k

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2

answers

404

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Why is $\tau(n) \equiv \sigma_{11}(n) \pmod{691}$?

number-theory algebraic-number-theory modular-forms

dec 30 '10 at 14:48 Derek Jennings 9,250

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3

votes

3

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395

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Find all continuous functions $f$ on $\mathbb{R}$ satisfying $f(x)=f(\sin x)$ for all $x$.

functional-equations

mar 1 at 5:40 Michael Albanese 4,658

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3

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394

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The resemblance between Mordell's theorem and Dirichlet's unit theorem

number-theory algebraic-number-theory elliptic-curves arithmetic-geometry

mar 5 at 12:58 QiL'8 15.3k

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7

votes

1

answer

388

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Toward “integrals of rational functions along an algebraic curve”

calculus reference-request riemann-surfaces

apr 30 at 20:56 Matt E 57.6k

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votes

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answer

365

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If $\gcd(a,b)=d$, then $\gcd(ac,bc)=cd$?

number-theory divisibility

jan 23 at 3:20 Gerry Myerson 85.7k

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answers

365

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Construct an isomorphism between fields

homework polynomials field-theory

jan 24 '11 at 17:43 Matt N. 15.2k

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364

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What is Spec $\mathbf{C}[[x,y]]/(y^{2} - x^{3} - x^{2})$?

homework algebraic-geometry commutative-algebra

dec 5 '10 at 23:37 evgeniamerkulova 1,021

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8

votes

2

answers

363

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How to find the integral closure of $\mathbb{Z}_{(3)}$ in the field $\mathbb{Q}(\sqrt{-5})$?

number-theory algebraic-number-theory

feb 25 '11 at 14:10 Pete L. Clark 44.3k

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7

votes

3

answers

356

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Picture of spec?

algebraic-geometry

nov 4 '10 at 0:29 Community♦ 1

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votes

2

answers

340

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Understanding dominating functions

measure-theory

nov 5 '10 at 4:30 Arturo Magidin 158k

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votes

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340

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Algebraization of integral calculus

calculus abstract-algebra integral

sep 2 '11 at 19:53 Community♦ 1

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11

votes

1

answer

340

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Classification of prime ideals of $\mathbb{Z}[X]$

commutative-algebra

jul 24 at 16:52 Arturo Magidin 158k

7

votes

1

answer

336

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How to compute localizations of quotients of polynomial rings

abstract-algebra algebraic-geometry commutative-algebra

feb 9 '12 at 9:28 Georges Elencwajg 44.8k

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votes

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answers

335

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$\mathbb{Q}[x,y]/\langle x^2+y^2-1 \rangle$ is an integral domain

abstract-algebra commutative-algebra ring-theory

apr 26 at 15:24 Community♦ 1

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333

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History of Modern Mathematics Available on the Internet

reference-request math-history

jun 8 '12 at 18:07 Holdsworth88 3,460

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3

answers

328

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About the localization of a UFD

abstract-algebra commutative-algebra

dec 6 at 20:35 Community♦ 1

1

vote

1

answer

326

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Proof from Reid's Undergraduate Algebraic Geometry: help with minor details

homework algebraic-geometry

nov 18 '10 at 20:08 Arturo Magidin 158k

3

10

votes

4

answers

318

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What are polar co-ordinates?

calculus linear-algebra

dec 25 '10 at 23:16 Dactyl 1,104

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316

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Learning path to the proof of the Weil Conjectures and étale topology

reference-request self-learning arithmetic-geometry

nov 22 at 11:41 Javier Álvarez 4,774

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313

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Integral domain with two elements that do not have a gcd

abstract-algebra commutative-algebra

may 5 '11 at 2:56 Community♦ 1

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14

votes

1

answer

308

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Can an integral scheme have closed points of both positive and zero characteristic?

algebraic-geometry schemes

nov 16 '10 at 1:07 Qiaochu Yuan 117k

Adrián Barquero

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