Skip to main content
Search type Search syntax
Tags [tag]
Exact "words here"
Author user:1234
user:me (yours)
Score score:3 (3+)
score:0 (none)
Answers answers:3 (3+)
answers:0 (none)
isaccepted:yes
hasaccepted:no
inquestion:1234
Views views:250
Code code:"if (foo != bar)"
Sections title:apples
body:"apples oranges"
URL url:"*.example.com"
Saves in:saves
Status closed:yes
duplicate:no
migrated:no
wiki:no
Types is:question
is:answer
Exclude -[tag]
-apples
For more details on advanced search visit our help page
Results found
Search options answers only not deleted not community wiki created 2013-09-28 - 2014-09-28
10 votes

Intrinsic significance of differential entropy

I would rather look at this from the opposite end. The key difference between the discrete and continuous cases is that in the discrete case there is a canonical reference measure, namely the counting …
R W's user avatar
  • 17k
7 votes

Probabilistic proofs of analytic facts

An outstanding result of this sort is the theorem of Tsirelson, MR1487755 Tsirelson, B. Triple points: from non-Brownian filtrations to harmonic measures. Geom. Funct. Anal. 7 (1997), no. 6, 1096–1142 …
Alexandre Eremenko's user avatar
5 votes
Accepted

Understanding a particular approximation for Stirling's number of the second kind

I cannot provide you with a reference, but I can sketch with my own derivation (I have a draft somewhere...). First, let $X$ be a zero-truncated multinomial $(n,k)$ random variable (we throw $n$ ball …
leonbloy's user avatar
  • 318
28 votes
Accepted

The Jones polynomial at specific values of $t$

The evaluation of the Jones polynomial at $e^{i\pi/3}$ is related to the number of 3-colourings $tri(K)$ of $K$ (see also here) as well as to the topology of the branched double cover $\Sigma(K)$: $$t …
Marco Golla's user avatar
  • 10.9k
8 votes
Accepted

Source of quotation about the waste-baskets of physicists

Here's one scientist (not quite a mathematician) who found gold in wastebaskets: I started looking in the trash cans of science for such phenomena [fractal scaling], because I suspected that what I wa …
LSpice's user avatar
  • 12.9k
2 votes

Source of quotation about the waste-baskets of physicists

A somewhat different quote has been attributed to Einstein: http://izquotes.com/quote/226612 (link broken now) https://quotefancy.com/quote/764082/Albert-Einstein-The-physicist-s-greatest-tool-is- …
Bjørn Kjos-Hanssen's user avatar
33 votes
Accepted

A curious identity related to finite fields

For prime $q \geq 5$ write the count as $$ \frac1{1152} q (q-1) (q^3 - 21q^2 + 171 q - c_q) $$ where $$ c_q = 483 + 36 \left(\frac{-1}{q}\right) + 64 \left(\frac{-3}{q}\right) + \delta_q. $$ Then for …
Martin Sleziak's user avatar
13 votes

Conceptual algebraic proof that Grassmannian is closed in Plücker embedding

Here is the argument I have written up in my thesis. It was suggested to me by my advisor Jarod Alper. We use the fact that a proper monomorphism is a closed immersion (EGA IV, 18.12.6). Furthermore, …
LSpice's user avatar
  • 12.9k
5 votes

If two projections are close, then they are unitarily equivalent

In Two Subspaces (Trans. AMS 1969), Halmos made some useful observations about pairs of subspaces/projections. When $\|p-q\|<1$, this yields in particular that we can assume, up to unitary equivalence …
Martin Argerami's user avatar
0 votes

Asymptotic comparison of $L^2$ sections versus generating sections

to your first question : $\int_X \frac{|t|^2}{\|e\|^2 \|s\|^2} \Omega$ is finite, being bounded above by $\sum_{i,j} |\lambda_{ij}|^2 vol_\Omega X$ i have found one paper on google which prove this th …
Martin Sleziak's user avatar
8 votes

What other monoidal structures exist on the category of sets?

The following family of examples can be extracted from Lenart and Ray, Some applications of incidence Hopf algebras to formal group theory and algebraic topology (Postscript). Let $B_2$, $B_3$, $B_4$, …
Martin Sleziak's user avatar
3 votes

What other monoidal structures exist on the category of sets?

Here is another possible source of tensor products on $\mathbf{Set}$: transferring tensor products from categories $\mathbf{Set}$ is coreflective in. Unfortunately I have no good example. Suppose $(\m …
Martin Sleziak's user avatar
11 votes
Accepted

If two projections are close, then they are unitarily equivalent

Edit: I'm leaving the old post below, but before I want to write the proof as suggested by Bruce from his book, which uses the ideas in a more efficient way. Assume that $\|p-q\|<1$, with $p,q\in A$, …
Martin Argerami's user avatar
20 votes

What other monoidal structures exist on the category of sets?

Plausibly we can construct examples from the power series expansion of formal group laws. We can try to write down such examples by writing down nice functions $q(x)$ and hoping that the formal group …
varkor's user avatar
  • 10.6k
7 votes

Character table of $S_7$

I am adding this because I am surprised no one has mentioned the wonderful CHEVIE package! This does precisely what the OP wants. For example. gap> W:=CoxeterGroup("A",6); CoxeterGroup("A",6) gap> Dis …
darij grinberg's user avatar

1
2 3 4 5
33
15 30 50 per page