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Jaakko Seppälä

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67 Questions

Views Newest Activity Votes

votes

answer

views

What is an intuitive meaning of genus?

algebraic-geometry arithmetic-geometry

Feb 22 '15 at 12:07 Georges Elencwajg 124k

votes

answers

133

views

Is $\Phi(q)$ rational for some $q \in \mathbb{Q}^*$, where $\Phi$ is the standard normal cumulative distribution function?

number-theory normal-distribution transcendental-functions

Feb 11 '18 at 0:33 Saad 21.4k

votes

answer

464

views

A finitely generated flat $A$-module $M$ is faithfully flat if and only if $\operatorname{Ann}(M)=0$

commutative-algebra modules flatness

Oct 13 '15 at 20:07 user26857 40.6k

votes

answers

views

Tensor product of two finitely generated modules

abstract-algebra commutative-algebra modules tensor-products finitely-generated

Jan 27 '15 at 21:55 Matt Samuel 46.3k

votes

answers

526

views

Line segments intersecting Jordan curve

general-topology

Jun 19 '12 at 21:18 Community♦ 1

votes

answers

views

Second degree Diophantine equations

diophantine-equations

Jan 30 '18 at 19:41 Bjorn Poonen 111

votes

answers

297

views

Flat algebra over a Dedekind domain

abstract-algebra commutative-algebra dedekind-domain maximal-and-prime-ideals flatness

Nov 26 at 3:26 darij grinberg 13.8k

votes

answers

153

views

Cyclic hexagon gives equilateral triangle

geometry complex-numbers vectors euclidean-geometry circles

Oct 21 '17 at 5:22 Michael Rozenberg 135k

votes

answer

226

views

Flatness and intersection of ideals [closed]

commutative-algebra ideals flatness

Aug 28 '17 at 9:29 Krish 6,444

votes

answers

views

How one defines $\int_0^t dt$?

calculus notation

Mar 12 '17 at 19:51 Olivier 3,731

votes

answers

522

views

Faithfully flat ring homomorphism properties

ring-theory commutative-algebra

May 19 '16 at 13:55 user 1 6,461

votes

answer

510

views

Quotient of ring is flat gives an identity of ideals

commutative-algebra ideals flatness

Jan 27 '15 at 15:54 user26857 40.6k

votes

answers

292

views

Flatness of integral closure over an integral domain

commutative-algebra modules integral-domain

Jan 26 '15 at 13:30 Jaakko Seppälä 2,233

votes

answers

168

views

How to find a non-surjective and non-injective tensor products of the formal completion?

commutative-algebra tensor-products

Oct 27 '18 at 21:51 Andrei.B 610

votes

answers

views

Is there formulas for $\sum_{g\in G}|\operatorname{Fix}(g)|^n$?

combinatorics group-theory

Dec 30 '17 at 1:03 Qiaochu Yuan 299k

votes

answer

views

Optimal way to cut grass on the rectangular area.

optimization euclidean-geometry calculus-of-variations

Aug 19 '17 at 1:47 guest 1

votes

answer

215

views

What would be an algorithm to shut down all lamps?

linear-algebra matrices algorithms sagemath

Jan 13 '17 at 15:59 Anonymous 5,348

votes

answers

101

views

How to shake hand with everybody as fast as possible?

discrete-mathematics algorithms

Oct 21 '16 at 12:51 Marc 6,318

votes

answers

119

views

Complete ring and unique continuous homomorphism

commutative-algebra radicals

Mar 1 '15 at 18:24 Jaakko Seppälä 2,233

votes

answer

143

views

Cokernel of a faithfully flat homomorphism

commutative-algebra flatness

Jan 31 '15 at 22:24 user26857 40.6k

votes

answers

340

views

Exact sequence with flat module tensored by module stays exact

commutative-algebra modules homological-algebra

Jan 17 '15 at 15:07 egreg 196k

votes

answers

163

views

Ideal contained in annihilator problem

abstract-algebra modules tensor-products

Jan 16 '15 at 20:56 user26857 40.6k

votes

answers

759

views

How to define a triangle

geometry

Jul 11 '14 at 2:06 Fazil Thokar 1

votes

answer

405

views

A quadratic polynomial getting square values in consecutive points

elementary-number-theory

Mar 17 '13 at 23:28 Gerry Myerson 156k

votes

answers

views

How to find a permutation to collect numbers with minimum number of rounds?

permutations algorithms

Nov 21 at 20:22 Jaakko Seppälä 2,233

votes

answer

views

How many turns it takes to cats in a chessboard jumps to the same square?

probability

Oct 16 '18 at 14:57 Oldboy 12.8k

votes

answer

136

views

How to find an algorithm to shut down all lamps with minimum number of moves?

linear-algebra optimization finite-fields sagemath

Dec 19 '17 at 13:54 Jyrki Lahtonen 116k

votes

answer

views

Does every positive number $n$ have a multiple, which has a monotonic digits in decimal basis? [closed]

combinatorics elementary-number-theory

Aug 12 '17 at 12:40 Davood KHAJEHPOUR 3,876

votes

answer

417

views

What is an algebraic field?

field-theory definition

Aug 4 '17 at 17:45 paul garrett 33.5k

votes

answers

109

views

Is there a Collatz-like sequence ending with $1,1,1,\ldots$?

elementary-number-theory conjectures

Mar 1 '17 at 18:53 Jaakko Seppälä 2,233

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67 Questions

What is an intuitive meaning of genus?

Is $\Phi(q)$ rational for some $q \in \mathbb{Q}^*$, where $\Phi$ is the standard normal cumulative distribution function?

A finitely generated flat $A$-module $M$ is faithfully flat if and only if $\operatorname{Ann}(M)=0$

Tensor product of two finitely generated modules

Line segments intersecting Jordan curve

Second degree Diophantine equations

Flat algebra over a Dedekind domain

Cyclic hexagon gives equilateral triangle

Flatness and intersection of ideals [closed]

How one defines $\int_0^t dt$?

Faithfully flat ring homomorphism properties

Quotient of ring is flat gives an identity of ideals

Flatness of integral closure over an integral domain

How to find a non-surjective and non-injective tensor products of the formal completion?

Is there formulas for $\sum_{g\in G}|\operatorname{Fix}(g)|^n$?

Optimal way to cut grass on the rectangular area.

What would be an algorithm to shut down all lamps?

How to shake hand with everybody as fast as possible?

Complete ring and unique continuous homomorphism

Cokernel of a faithfully flat homomorphism

Exact sequence with flat module tensored by module stays exact

Ideal contained in annihilator problem

How to define a triangle

A quadratic polynomial getting square values in consecutive points

How to find a permutation to collect numbers with minimum number of rounds?

How many turns it takes to cats in a chessboard jumps to the same square?

How to find an algorithm to shut down all lamps with minimum number of moves?

Does every positive number $n$ have a multiple, which has a monotonic digits in decimal basis? [closed]

What is an algebraic field?

Is there a Collatz-like sequence ending with $1,1,1,\ldots$?