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johndcook.com

John D. Cook

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Latest posts

Last updated about 6 hours ago

Hiding data in permutations

about 6 hours ago

The latest issue of Paged Out! has an article by Stephen Hewitt...

Counting permutations with roots

about 13 hours ago

My post from yesterday on permutation roots ends with a Mathematica code...

Printing floating point numbers in binary

about 14 hours ago

It’s well known that you can convert the base 16 (hex) representation...

Permutation roots

1 day ago

Let σ be a permutation on n elements. If there is a...

exp_q

1 day ago

The function expq(x) is defined by taking the power series for exp(x)...

Excel column numbering

3 days ago

I was working with a wide spreadsheet from a client the other...

An almost periodic function

5 days ago

This post takes a more abstract view of the previous post. That...

When sine of x degrees equals sine of x radians

6 days ago

Ordinarily the sine of x radians and the sine of x degrees...

Forensic accounting in Python

7 days ago

I recently had a project in which I had to reverse engineer...

Locally everywhere does not imply everywhere

7 days ago

A couple days ago, Levent Alpöge, a mathematician working at Anthropic, discovered...

Solving a chess puzzle with Grok 4.5

8 days ago

I’ve written several posts about using Claude or ChatGPT to generate Prolog...

Volume to Area ratio for Regular Solids

8 days ago

The volume of a sphere of radius r is V = 4πr³...

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