## All Questions

879 views

### Properties of monodromy of a fibration?

Sorry for a loaded question. I'm not an expert on those things, but I do know that a fibration gives rise to the representations of pointed fundamental group of the base on the co …
932 views

### Asymptotics of a hypergeometric series/Taylor series coefficient.

I was planning on figuring this problem out for myself, but I also wanted to try out mathoverflow. Here goes: I wanted to know the asymptotics of the sum of the absolute values o …
762 views

### Algorithms for maximum weighted spanning (connected) dag (directed acyclic graph)

Suppose I have a weighted directed graph, often with symmetric links. I was to compute a maximum weight spanning DAG subgraph that is connected. I can't find any references to anyt …
434 views

568 views

### Ambiguous definition of “nerve of an open covering” on wikipedia?

Let $(U_i)_{i\in I}$ be an open covering of a topological space $X$. At http://en.wikipedia.org/wiki/Nerve_of_an_open_covering, the nerve of the open covering is defined as follow …
816 views

### Examples of Equivariant Sheaves under Group action

I feel it very unintuitive to understand what an equivariant sheaf is. In the simplest example, L/K is a finite Galois extension, G=Gal(L/K), G acts on Spec L, what are the equivar …
821 views

### Analogue of Shimura curves in the symplectic case?

My understanding is this: one can attach 2-d Galois representations to classical modular eigenforms because one can look in the etale cohomology of modular curves. For Hilbert modu …
333 views

### Automorphisms of the totally ordered group Z^n with lexicographical order

It is easy to see that the totally ordered group Z (the integers) with the natural order has no non-trivial automorphisms. Is this also true for Z^n with the lexicographical order? …
Let's introduce the following variety $MG(3,6)$, which is a "multisymplectic" analog of a Lagrangian Grassmannian $LG(3,6)$. Consider a 3-form \$\omega = dx1 \wedge dx2 \wedge dx^3 …