Thomas Ahle's user avatar
Thomas Ahle's user avatar
Thomas Ahle's user avatar
Thomas Ahle
  • Member for 12 years, 7 months
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21 votes
3 answers
2k views

Efficient computation of $\sum_{k=1}^n \left\lfloor \frac{n}{k}\right\rfloor$

15 votes
1 answer
376 views

How did I solve this (triply logarithmic) equation?

14 votes
1 answer
424 views

Fastest curve from $p_0$ to $p_1$

10 votes
1 answer
824 views

Can a planar graph be drawn with all vertices on a straight line?

10 votes
2 answers
552 views

$E[|X-\mu|^n] \le 2 E[|X-\mu|^{n+1}]$ for Integer Random Variables

8 votes
2 answers
129 views

The expectation of $e^X \left(1-(1-e^{-X}\right)^n)$ when $X$ has Exponential Distribution

8 votes
1 answer
2k views

Difference between $R^\infty$ and $R^\omega$

8 votes
4 answers
1k views

Sum of kth roots ($\sum\sqrt[k]{m}$)

8 votes
2 answers
351 views

How to check if polylines can be untangled?

7 votes
1 answer
7k views

Sharper Lower Bounds for Binomial/Chernoff Tails

7 votes
2 answers
176 views

A Weighted Gaussian Inequality: $E[\frac{\sigma_n^2 x_n^2}{\sum_{i=1}^n \sigma_i^2x_i^2} ] \ge \frac{\sigma_n^2}{\sum_{i=1}^n \sigma_i^2}$

7 votes
2 answers
208 views

How can I improve my proof of Stirling's Theorem?

6 votes
2 answers
805 views

Is conditional entropy ever taken to be a random variable?

6 votes
5 answers
464 views

Does 'let x be a member of S...' require axiom of choice? [duplicate]

6 votes
4 answers
468 views

Entropy Lower Bound in Terms of $\ell_2$ norm

5 votes
1 answer
678 views

$\Pr[\sum_i X_i^2 Y_i^2\ge t]$, Chernoff bound for sum of pairs of squared Normal random variables

5 votes
1 answer
462 views

Tail Lower Bounds using Moment Generating Functions

5 votes
2 answers
3k views

Connection to Normal distribution

5 votes
1 answer
399 views

Power Mean Random Distribution

5 votes
2 answers
316 views

When can a metric space be embedded in the plane?

5 votes
2 answers
1k views

Asymptotic Moments of the Binomial Distribution, $E(X/(np))^k = 1 + O(k^2/n)$?

5 votes
0 answers
155 views

Geometric interpretation of $x_1^2y_1^2+x_2^2y_2^2+x_3^2y_3^2+\dots$

4 votes
1 answer
187 views

Are there any secure ciphers you can use without a computer?

4 votes
1 answer
160 views

Lower bound for $(x^c-1)^{1/c}$

4 votes
1 answer
93 views

Example of operation that is tree associative, but not generally associative

4 votes
0 answers
72 views

Expectation of $\frac{\langle Gx, Gy\rangle}{\|Gx\|_2\|G y\|_2}$ where $\langle x, y\rangle = \rho$

4 votes
0 answers
146 views

Examples of bijective polynomials $\mathbb C^n\to\mathbb C^n$ that aren't linear.

4 votes
0 answers
59 views

Matrix Recurence Relation, $M_n=M_{n-1}M_{n-2}$

4 votes
3 answers
219 views

Log (uniform) continuous functions

3 votes
2 answers
190 views

Distribution of $\sum_k \alpha^k X_k$