11h
answered Why do Integer Relation Algorithms (e.g. PSLQ) not solve the knapsack problem?
1d
answered Basis reduction and continued fractions
1d
answered What is a good introduction to quantities such as the norm of a lattice and of short vectors in the context of lattice reduction?
1d
asked Upper bound on the product of norms of vectors in a lattice basis
Mar
21
answered What are the properties of this Poisson algebra?
Mar
3
awarded  Yearling
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
awarded  Custodian