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12 votes

What kind of computer tools topologists/geometrists use to visualize the objects they deal with?

soft-question mathematics-education mathematical-software software asked Aug 8 '18 at 16:05
mathoverflow.net

12 votes

Looking for a way to create a particular matrix in python in a less amount of time

python time-limit-exceeded matrix numpy asked Oct 30 '18 at 8:02
codereview.stackexchange.com

8 votes

Solving the matrix equation $X^tA+A^tX=0$ for $X$ in terms of $A$

linear-algebra matrix-equations matrix-calculus matrix-decomposition computer-vision asked Dec 27 '18 at 19:46
math.stackexchange.com

7 votes

What is the equivalent way of doing this type of pythonic vectorized assignment in MATLAB?

python matlab vectorization asked Dec 12 '18 at 19:42
stackoverflow.com

6 votes

Does localization in commutative algebra really “localize” our study of a variety?

algebraic-geometry commutative-algebra intuition asked Dec 11 '17 at 0:47
math.stackexchange.com

6 votes

How many triangles are there in the 'picture' of $K_5$? Different ways to count it

combinatorics group-theory graph-theory recreational-mathematics asked Jun 19 '18 at 9:18
math.stackexchange.com

6 votes

If two rotation matrices commute, do their infinitesimal generators commute too?

linear-algebra lie-groups lie-algebras rotations matrix-exponential asked Jan 8 at 11:47
math.stackexchange.com

5 votes

Reference request: introductory level book for Riemann surfaces

reference-request soft-question book-recommendation riemann-surfaces asked Mar 2 at 6:24
math.stackexchange.com

5 votes

Randomly permute $\{1,\cdots,100\}$. What is the probability that none of the $S_k$'s defined by $\sigma(1)+\cdots+\sigma(k)$ is divisible by $3$?

probability proof-verification stochastic-processes permutations contest-math asked Oct 12 '18 at 11:31
math.stackexchange.com


Top Answers
16
Spivak or Apostol to prepare for learning Baby Rudin on my own?
math.stackexchange.com

13
Why is continuity characterized with open sets?
math.stackexchange.com

13
About the definition of curvature
math.stackexchange.com

12
Is the proof of Pythagorean theorem using dot (inner) product circular?
math.stackexchange.com

12
Why can a real number be defined as a Dedekind cut, that is, as a set of rational numbers?
math.stackexchange.com

10
Is there a set whose power set is countably infinite?
math.stackexchange.com

8
Finding: $\lim\limits_{x\to -\infty} \frac{6x^2+5\cos{\pi x}}{\sqrt{x^4+\sin{5\pi x}}}$
math.stackexchange.com

8
“Numbers” bigger than every natural number
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8
The rate at which the value of a definite integral increases
math.stackexchange.com

7
Find $x$ such that $2^x+3^x-4^x+6^x-9^x=1$
math.stackexchange.com

7
If $f \in C[a,b]$ has $\int_{a}^{b}f(x)x^{n}dx=0$ for all $n\in \mathbb{N}$, then $f=0$.
math.stackexchange.com

6
$f: \mathbb{R} \to\mathbb{R}$ is differentiable and $f^{\prime}(0)>0$, does there exist an open neighborhood such that $f^{\prime}(I) >0 $?
math.stackexchange.com

6
A matrix raised to a high power ($87$)
math.stackexchange.com

5
Check if $\ln(x), x > 0$ is uniformly continuous
math.stackexchange.com

5
Calculate $\lim _{x\to \infty}\left(\frac{3x^2+7}{2x^2+4x}\right)^{3x}$
math.stackexchange.com

5
What is the intuition behind saying that the nilradical is the intersection of prime ideals?
math.stackexchange.com

5
Calculate the integral $\int_{0}^{\infty} t^{-3/2}e^{-a/bt-ct}\,\mathrm{d}t$
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5
Metric space question in convergence
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5
How to catch proof errors during self study?
math.stackexchange.com

5
What functions, if any, can NOT be approximated by a Taylor series?
math.stackexchange.com

5
Find all values of $k$ for $kx^2+(k+2)x-3=0$ with positive roots.
math.stackexchange.com

5
The space of all finite-degree polynomials $\mathbb{P}$ is not complete in any norm.
math.stackexchange.com

5
Can a sum of a convergent and divergent integral be convergent?
math.stackexchange.com

5
If $a_n^2 \to 4$ prove that $a_n$ has a subsequence converging to $2$ or $-2$
math.stackexchange.com

5
Let $f$ be a function from a metric space to a metric space. Prove that $f$ is continuous i.f.f it sends convergent sequences into convergent seq.
math.stackexchange.com

5
Evaluate $\lim\limits_{x \to 0} \dfrac{(ax+1)^b - (bx+1)^a}{x^2}$
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