Timothy Wagner

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When does the distributive law apply to ideals in a commutative ring?

abstract-algebra commutative-algebra ideals gcd-and-lcm asked Dec 13, 2010 at 0:16

math.stackexchange.com

20 votes

Is a Gödel sentence logically valid?

logic asked Dec 9, 2010 at 16:14

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20 votes

Strategies for digging through literature

soft-question asked Nov 17, 2010 at 22:17

mathoverflow.net

19 votes

When do the Freshman's dream product and quotient rules for differentiation hold?

calculus differential-equations asked Nov 19, 2010 at 4:54

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18 votes

Equilateral polygon in a plane

geometry algebraic-number-theory asked Nov 23, 2010 at 3:36

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14 votes

A vector space over $R$ is not a countable union of proper subspaces

linear-algebra real-analysis abstract-algebra asked Nov 17, 2010 at 21:59

math.stackexchange.com

9 votes

(Krull) dimension of any associated graded ring of a ring R equals the dimension of R

ac.commutative-algebra ra.rings-and-algebras asked Nov 13, 2010 at 4:04

mathoverflow.net

7 votes

One dimensional quotients of formal power series rings

abstract-algebra commutative-algebra ring-theory asked Nov 20, 2010 at 17:55

math.stackexchange.com

7 votes

Rational powers of ideals in Noetherian rings

ac.commutative-algebra ra.rings-and-algebras asked Dec 2, 2010 at 14:30

mathoverflow.net

6 votes

The Jacobian ideal generates the socle of a complete intersection

ac.commutative-algebra algebraic-number-theory reference-request asked Nov 18, 2010 at 2:33

mathoverflow.net

Top Answers

How to show that every Boolean ring is commutative?

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Does $R[x] \cong S[x]$ imply $R \cong S$?

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$I+J=1 \Rightarrow I^n+J^n = 1$ for ideals (or elements in GCD domain) [Freshman's Dream Binomial Theorem]

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Can $n!$ be a perfect square when $n$ is an integer greater than $1$?

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Intuition behind $dx \wedge dy=-dy \wedge dx$

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Can I learn Calculus on the web, for free, using simple tutorials?

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Limit of the nested radical $\sqrt{7+\sqrt{7+\sqrt{7+\cdots}}}$

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A Laskerian non-Noetherian ring

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Factorial of a non-integer number

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deadline in math jobs application

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Algebraic structure cheat sheet anyone?

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What are good books/other readings for elementary set theory?

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Relationship between subrings and ideals

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A different proof of the insolubility of the quintic?

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chance on throwing a six with 6 dice

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How to prove the Pythagoras theorem using vectors

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Proof of the formula $1+x+x^2+x^3+ \cdots +x^n =\frac{x^{n+1}-1}{x-1}$

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The final state of 1000 light bulbs switched on/off by 1000 people passing by

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Isometry in compact metric spaces

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Axiom of choice - to use or not to use

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Intuition in algebra?

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Symmetric polynomials and the Newton identities

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Suggest a tricky method for this problem

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Multiplication of Power Series and their convergences

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Resources/Books for Discrete Mathematics

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If a second car leaves later at a higher speed, how long will it take to catch up?

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how to read a mathematical paper?

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Are associates unit multiples in a commutative ring with $1$?

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Proof that dividing irrational number by an irrational number can result in an integer?

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How to introduce notions of flat, projective and free modules?

mathoverflow.net