The similarity tag has no usage guidance.

**14**

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503 views

### Some questions on unitarisability of discrete groups

In this post I would like to ask several of questions related to Dixmier problem. I will try to make the post as self-contained as possible.
A discrete group $G$ is unitarisable if for every Hilbert ...

**2**

votes

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136 views

### Is there an universal (dis)similarity measure between two structures?

I'm always wondering is there an universal (dis)similarity measure
between two structures (let's say between two undirected simple
graphs)? I mean, not "the measure with universal parameter that we
...

**1**

vote

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65 views

### Quantification of the extent of periodicity in a time series using fractal analyses

I need metrics to quantify and compare the extent of periodicity between any two given time series, considering the time series were "almost periodic". By "almost periodic" I mean: if I were to take ...

**1**

vote

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161 views

### Universal Correlation measure — ranking correlations

I have time series data of experimental observations for two related processes. I want to measure correlation for use in further analysis.
Correlation of the series changes over time and across ...

**0**

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46 views

### Eigenvalues of sum of two fuchsian matrices

Dear mathoverflow users,
I am trying to solve a problem concerning eigenvalues and sum of matrices.
In particular: consider the expression
$$
A=\frac{E}{x-x_1}+\frac{F}{x-x_2},
$$
and suppose to know ...