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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 …
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 …
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 …
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 $\Sigma(K)$:
$$t …
8
votes
Accepted
Source of quotation about the waste-baskets of physicists
Here's one scientist (not quite a mathematician) who found gold in wastebaskets:
I started looking in the trash cans of science for such phenomena [fractal scaling], because I suspected that what I wa …
2
votes
Source of quotation about the waste-baskets of physicists
A somewhat different quote has been attributed to Einstein:
http://izquotes.com/quote/226612 (link broken now)
https://quotefancy.com/quote/764082/Albert-Einstein-The-physicist-s-greatest-tool-is- …
33
votes
Accepted
A curious identity related to finite fields
For prime $q \geq 5$ write the count as
$$
\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 …
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, …
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 …
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 …
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 $B_2$, $B_3$, $B_4$, …
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 …
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 $p,q\in A$, …
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 …
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 …