# All Questions

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### Is there a unique saddle value for a convex/concave optimization?

I asked this question previously in math.stackexchange and couldnt receive any answer. The question is fundamental, though I couldn't find a reference or a proof somewhere. Here is the question: ...
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### Applications of Szemeredi's Theorem

Szemeredi's Theorem is a famous theorem in Additive Combinatorics, Ergodic Theory and maybe some other parts of Mathemtaitcs: (Szemeredi's Theorem) Let $\Lambda \in \mathbb{Z}$ be a subset of ...
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### Refomulation of a theorem for special case

This question is about some theorems in the book "Analysis Now" from Pedersen. In particular Proposition $5.3.2$ and Theorem $5.3.3$. Here one has a essential $*$-isomorphism of some algebra $L(X)$ ...
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### Dieudonné modules -reference request

I need a reference to start learning about Dieudonn\'e modules, and their application to the arithmetic of abelian varieities. I know that this is a copy of Reference for Dieudonné modules, ...
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### Finite element method p2 2d [on hold]

I'm preparing my graduate project and i really need some help to implement FEM 2D with quadratic element triangles, so i have done everything so far and i think the problem is in the assembling of the ...
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### Consecutive numbers with mutually distinct exponents in their canonical prime factorization

Is it possible to find 23 consecutive positive integers each of which has mutually distinct exponents in its canonical prime factorization? Such numbers are sequence A130091 in OEIS. 24 such numbers ...
I'm investigating 3D image deblurring and one of the approaches I'm interested in is applying spatial regularisation. To do this I have generated a matrix $A$ which encodes the 6-connectivity of each ...