Arnold Neumaier

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Mar
3
 awarded  Yearling
Dec
2
 accepted classical solutions of PDE with mixed boundary conditions
Dec
2
 comment classical solutions of PDE with mixed boundary conditions
Thanks. These and especially their reference to Azzam and Kreyszig are very useful!
Nov
13
 comment Eigenvalues of a bipartite graph
@Shahab: It implies that $k|x|=A|x|$. For if this fails then there is strict inequality in at least one component, and multiplication by $u^T>0$ gives a strict inequality, contradiction.
Nov
9
 comment Spectrum of a Block Matrix
@Timothy: intuitively: Draw a graph of the corresponding quadratic functions and you'll see where the inequalities hold. - formally: complete the squares, take square roots, and discard the signs not compatible with the case.
Nov
8
 answered If $d^2|p^{11}$ where $p$ is a prime, explain why $p|\frac{p^{11}}{d^2}$.
Nov
8
 answered Spectrum of a Block Matrix
Nov
7
 comment Spectrum of a Block Matrix
What is your motivation for this conjecture?
Nov
7
 answered Eigenvalues of a bipartite graph
Nov
6
 comment Number of local maxima of a function
@EwanDelanoy: $F(x)=c$ is the quotient of two polynomials of degree $2k$. So my original $2k-1$ was one off. I corrected the mistake.
Nov
6
 revised Number of local maxima of a function
corrected a mistake in the degree
Nov
3
 awarded  Tumbleweed
Oct
29
 asked good books on measures and integration theory in infinite-dimensional spaces
Oct
27
 asked sufficient conditions for cumulant generating functions
Oct
27
 awarded  Custodian
Oct
27
 reviewed Approve suggested edit on Monge-Ampere like equation
Oct
27
 asked Monge-Ampere like equation
Oct
25
 awarded  Revival
Oct
24
 answered Number of local maxima of a function
Oct
24
 accepted Infinite-dimensional translation-invariant measure
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