johndcook.com > blog
An integral theorem of Gauss
1+ day, 7+ hour ago —...Gauss proved in 1818 that the value of integral is unchanged if x... ...Maybe if we apply Gauss’ theorem again and again, the coefficients...
johndcook.com > blog
El Salvador’s Bitcoin and Quantum Computing
2+ day, 7+ hour ago —...The treasury of El Salvador owns over 6,000 Bitcoins.... ...Yesterday El Salvador announced that it would split its funds into...
johndcook.com > blog
How quantum computing would effect Bitcoin
2+ day, 8+ hour ago —...Bitcoin relies on two kinds of cryptography: digital signatures and... ...To be more specific, the kind of digital signatures used in Bitcoin...
johndcook.com > blog
Storing data in images
3+ day, 5+ hour ago —...that links to my Kingwood Data Privacy site.... ...James Burke hosted a BBC series called Connections in which he would... ...In this post we’ve connected Jupiter to Bitcoin. How?... ...discussing Ondřej’s experiment, which led to Golay codes, which...
johndcook.com > blog
An uncrossed knight’s tour
3+ day, 7+ hour ago —...tour is part of the article Uncrossed Knightâs Tours in Donald Knuthâ... ...Cook....
johndcook.com > blog
Dithered QR codes
4+ day, 1+ hour ago —...Here’s one for my data privacy company, Kingwood Data Privacy LLC... ...I saw a post by Dave Richeson on Mastodon about making QR codes that...
johndcook.com > blog
Probability of typing a wrong Bitcoin address
4+ day, 3+ hour ago —...Someone with the Caesarean handle Veni Vidi Vici on X asked What... ...There are several kinds of Bitcoin addresses....
johndcook.com > blog
Why are CUDA kernels hard to optimize?
4+ day, 21+ hour ago —...Older architectures like Sun Sparc or Cray vector processor, complex... ...from a slightly different angle, see this excellent work from Matt Sinclair...
johndcook.com > blog
Riemann's differential equation a P-symbol, P for Papperitz
5+ day, 5+ hour ago —...The symbol is also known as the Papperitz symbol because Erwin Papperitz... ...invented the symbol for expressing solutions to Bernard Riemann’...