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johndcook.com
johndcook.com > blog > 09/09/2026 > four-colors

A 50-year-old computer-assisted proof

4+ day, 18+ hour ago   (254+ words) The idea of using computers to assist with proofs is not new. The first major computer-assisted proof was published in 1976, the proof of the four color theorem by Kenneth Appel and Wolfgang Haken. The authors reduced the proof of the…...

johndcook.com
johndcook.com > blog > 09/03/2026 > hugging-face-easter-egg

Hugging Face Easter Egg

1+ week, 3+ day ago   (142+ words) NVIDIA has offered by buy Hugging Face for $12,930,300,000. 129303 is the Unicode code point for the Hugging Face emoj (U+1F917), which you can verify with the following Python code. >>> import unicodedata >>> 129303 == 0x1F917 True >>> unicodedata.name(chr(0x1F917)) 'HUGGING FACE' Related posts Prevent characters…...

johndcook.com
johndcook.com > blog > 09/03/2026 > new-rsa-number-factored

New RSA number factored

1+ week, 3+ day ago   (244+ words) Eric Lu announced on X today that he has factored RSA-260, a number N with 260 digits (862 bits) that is the product of two large primes [1]. RSA numbers are challenge problems posed to gauge the security of RSA encryption, which rests…...

johndcook.com
johndcook.com > blog > 08/15/2026 > compressing-a-hadamard-matrix

Compressing a Hadamard matrix

4+ week, 1+ day ago   (469+ words) Hadamard matrices are in the news following the recent announcement of a newly discovered Hadamard matrix. I’ve written three posts on Hadamard matrices recently, one as a sort of introduction and two on applications: the error correcting code used in…...