BenjaLim

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How does one give a mathematical talk?

commutative-algebra soft-question advice asked May 31 '12 at 11:44

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20 votes

Math symbols displayed in Fermat's Last Theorem documentary

number-theory asked Dec 28 '12 at 11:45

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15 votes

Compactness of $\operatorname{Spec}(A)$

general-topology commutative-algebra asked Jan 31 '12 at 14:35

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15 votes

Material in a first course in algebraic geometry?

reference-request algebraic-geometry asked Feb 12 at 4:50

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13 votes

Introductory texts on manifolds

reference-request differential-geometry asked Jun 20 '11 at 15:10

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13 votes

Exercise 2.17(d) of Eisenbud's Commutative Algebra text

commutative-algebra asked May 30 '12 at 13:50

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12 votes

Classification of covering spaces of $\Bbb{R}\textrm{P}^2 \vee \Bbb{R}\textrm{P}^2$.

algebraic-topology asked Aug 23 '12 at 10:50

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11 votes

Good exercises to do/examples to illustrate Seifert - Van Kampen Theorem

reference-request algebraic-topology big-list asked Aug 5 '12 at 10:02

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10 votes

References on Linear Algebraic Groups/Lie Theory

reference-request lie-groups lie-algebras big-list algebraic-groups asked Sep 4 '12 at 14:54

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9 votes

Proof that dim$(U \times V)$ = dim $U$ + dim $V$

linear-algebra asked Jul 9 '11 at 13:35

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Top Answers

Direct Proof that $1 + 3 + 5 + \cdots+ (2n - 1) = n\cdot n$

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Proofs that every mathematician should know?

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Prove that $\mathbb{C}[x,y] \ncong \mathbb{C}[x]\oplus\mathbb{C}[y]$

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What is the best way to develop Mathematical intuition?

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Is there any difference between the definition of a commutative ring and field?

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Compactness of $\operatorname{Spec}(A)$

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Nice examples of groups which are not obviously groups

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What is the geometric meaning of singular matrix

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Is the size of the Galois group always $n$ factorial?

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If $f(x + y) = f(x) + f(y)$ showing that $f(cx) = cf(x)$ holds for rational $c$

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Is a countable subspace of a metric space closed?

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What's a good place to learn Lie groups?

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Prove that $H = \{x \in G \mid x=x^{-1}\}$ is a subgroup.

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The determinant function is the only one satisfying the conditions

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If $I$ is a maximal ideal of $R$, why is $R/I$ a field?

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A ring is a field iff the only ideals are $(0)$ and $(1)$

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If $A$ an integral domain contains a field $K$ and $A$ over $K$ is a finite-dimensional vector space, then $A$ is a field.

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Question about proof of $A[X] \otimes_A A[Y] \cong A[X, Y] $

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Vandermonde Determinant

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Getting the determinant value of the original matrix from its upper triangular matrix

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Differential equation with a constant in it

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Does anyone know of a complete list of theorems?

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The boundary is a closed set

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The Frobenius endomorphism

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Computing $\operatorname{Ext}^1_R(R/x,M)$

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Is $\;\det(A^n) =\left(\det (A)\right)^n\;$?

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Proving that $\mathbb{Z}[x]$ and $\mathbb{Q}[x]$ are not isomorphic.

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What is the meaning of “algebraically indistinguishable”

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Polynomial ring over $\mathbb{Z}_2$

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$\mathbb{R}\subset\mathbb{F}\subset\mathbb{C}$ implies $\mathbb{F}=\mathbb{R}$ or $\mathbb{F}=\mathbb{C}$?

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