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2d
revised How to prove this determinant is positive-II?
added 760 characters in body
2d
revised How to prove this determinant is positive-II?
added 311 characters in body
2d
answered How to prove this determinant is positive-II?
Apr
16
comment On the density of the sequence $\{n \{n \xi \} \}_n$
I am curious as to why your number sequence arises in PDE, all I can think of is KAM theory. For example Resonances and Small Divisors by Etienne Ghys
Apr
16
answered On the density of the sequence $\{n \{n \xi \} \}_n$
Apr
16
comment Classification of symmetries of tilings in surfaces?
@ArcadioBuendía how to general Riemann surfaces have symmetry
Apr
12
answered Classification of symmetries of tilings in surfaces?
Apr
11
comment Euler-Lagrange equations and Bellman's principle of optimality
looking again at your question, there is nothing about discretization or dynamic programming except for Bellman's name. Perhaps I will read up and ask my own question 😯
Apr
8
awarded  Notable Question
Apr
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Apr
6
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Apr
5
comment theta functions and Brownian motion
the theta function looks kind of like Batman
Apr
5
asked theta functions and Brownian motion
Apr
5
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Apr
4
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Apr
3
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Apr
2
comment power laws emerging from the sandpile model
How related are 1/f noise and self-organized criticality? And separately. Does sandpile model exhibit 1/f noise of any kind?
Apr
2
comment Does homology have a coproduct?
Can you explain why $C_{ij}\equiv C_i \times C_j$ is such a natural piece of notation? I have never had intuition for co-multiplication. To me it looks just likr factoring. Is $6=2\times 3$ a co-multiplication ?
Apr
1
accepted What kind of geometric object is the Pauli spin matrix vector $\vec{\sigma} = (\sigma_1, \sigma_2, \sigma_3)$?
Apr
1
comment Have the explicit Poisson-type formulas of Guinand and Meyer been observed before?
@ThomasSauvaget The radius values $D_\square$ are numbers of the form $\sqrt{m^2 + n^2}$. These are like Guinand's use of the numbers: $$ |k - a| = \sqrt{ (k_1 - a_1)^2 + (k_2 - a_2)^2 + (k_3 - a_3)^2}$$ where $\vec{k} \in \mathbb{Z}^3$ and $\vec{a} \notin \mathbb{Z}^3$. These are the distances of the coset $\vec{a} + \mathbb{Z}^3$ to the origin.