1. ## Some Naive Thoughts on Bitcoin Gambling: Hold or Sell?

I own some bitcoin and I intend to hold for a really long time. The total value of my crypto holdings is small enough that I would be OK with it losing all of it, but I would really prefer it to grow instead.

There are moments when I believe …

2. ## Modifying a Plustek 8100 to Scan Medium Format

The Plustek 8100 is a relatively cheap but good quality film scanner. It produces much nicer scans than most flatbed-type scanners, but it can only capture small format film. In this page I show how to modify a Plustek 8100 to scan medium format (120 film) by stitching together multiple …

3. ## A Class of Multivariate Functions that Behave Like Single-Letter Random Variables

Vector-encoders of a certain pretty restricted class happen to carry the same information content as univariate encoders. This turns out to be relevant to an aspect of time-expanded information bottlenecks.

### Claim

Take $X _ 1,\dots, X _ n$ iid over finite alphabet …

4. ## Extracting Relevant Information over Many Trials

The information bottleneck scenario goes like this:

We are interested in a quantity $Y$ but only observe $X$ which we must process down to a rate $R \in (0, H(X)).$ To this end, what random variables $(U,Q)$ minimize

5. ## Hypersphere Cap Volumes in Matlab

The volume of a height-$h$ cap of a ball of radius $r$ in dimension $n$ can be derived:

\operatorname{vol}(\operatorname{cap}) = \frac{1}{2} \cdot \frac{\pi^{n/2}}{\Gamma\left(1+n/2\right)} \cdot r^n \cdot I_{(2rh-h^2)/r …

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