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John D. Cook
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Latest posts
Last updated about 9 hours ago
How blocks are chained in a blockchain
about 9 hours ago
The high-level explanation of a blockchain says that each block contains a...
987654321 / 123456789
1 day ago
I recently saw someone post that 987654321/123456789 is very nearly 8, specifically...
Spacing the circles on the Smith chart
2 days ago
The previous post looked at the basics of how to create a...
The Smith chart
4 days ago
The Smith chart from electrical engineering is the image of a Cartesian...
Generating random points in Colorado
6 days ago
The previous post looked at how to generate random points on a...
Random spherical coordinates
6 days ago
The topic of generating random points on a unit sphere has come...
Distribution of correlation
8 days ago
One of the more subtle ideas to convey in an introductory statistics...
Distribution of coordinates on a sphere
9 days ago
Almost Sure posted an interesting fact on X If a point (x,...
ODE to Fisher’s transform
9 days ago
I was calculating a correlation coefficient this afternoon and ran into something...
Turning trig identities into Fibonacci identities
11 days ago
In 2013, John Conway and Alex Ryba published a brief note [1]...
Experiences with GPT-5-Codex
11 days ago
OpenAI Codex is now generally available (see here, here). I’m using the...