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John D. Cook
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Latest posts
Last updated 4 days ago
Zooming in on a fractalish plot
4 days ago
The exponential sum of the day page on my site draws an...
Most ints are not floats
6 days ago
All integers are real numbers, but most computer representations of integers do...
Test whether a large integer is a square
6 days ago
Years ago I wrote about a fast way to test whether an...
Legendre and Ethereum
7 days ago
What does a eighteenth century French mathematician have to do with the...
Patching functions together
8 days ago
The previous post looked at a function formed by patching together the...
Uniformity increases entropy
9 days ago
Suppose you have a system with n possible states. The entropy of...
Sinc function approximation
10 days ago
The sinc function sinc(x) = sin(x) / x comes up continually in...
Arithmetic for fun and profit
10 days ago
Four years ago I wrote a blog post about simple solutions to...
Why use hash puzzles for proof-of-work?
11 days ago
A couple days ago I wrote about the the problem that Bitcoin...
Minimize squared relative error
12 days ago
Suppose you have a list of positive data points y1, y2, …...
What is the Bitcoin proof-of-work problem?
13 days ago
In order to prevent fraud, anyone wanting to add a block to...