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plus.maths.org on Hacker News

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Screenshot of plus.maths.org: Take a break: Error-detecting codes in credit card numbers, ISBNs etc. (2000)

Take a break: Error-detecting codes in credit card numbers, ISBNs etc. (2000)(plus.maths.org)

77 points by signa11 2 years ago | 17 comments

Screenshot of plus.maths.org: Circles rolling on circles (2014)

Circles rolling on circles (2014)(plus.maths.org)

50 points by montalbano 3 years ago | 19 comments