The spectral-gap tag has no wiki summary.

**2**

votes

**2**answers

312 views

### Estimating a spectral gap

Suppose you have a real positive definite matrix $A$ who eigenvalues are $\lambda_{1} \leq \lambda_{2} \leq \ldots \leq \lambda_{n}$. I am interested in bounding from below $\lambda_{2}-\lambda_{1}$. ...

**0**

votes

**0**answers

40 views

### spectral gap of reversible diffusion processes

Let's suppose that we want to consider a reversible diffusion process, which has transition density and a unique stationary distribution, for instance, O-U process with generator
$$
...

**17**

votes

**0**answers

655 views

### Could unramified Galois groups satisfy a version of property tau?

This is an experiment: there is a question I want to mention in an article I'm writing, and I am not sure it's a sensible question, so I will ask it here first, in the hopes that if it's insensible ...