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1f604
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I deleted a question that I asked on the mathematics meta stackexchange but someone undeleted it lol. I deleted it again, lol.

I created a checksum which is a generalization of the ISBN-10 checksum (one could perhaps call it the ISBN-n checksum).

https://web.archive.org/web/20230322145158/https://math.stackexchange.com/questions/4664122/proving-my-checksum-detects-all-single-character-typos-and-adjacent-transpositio

^ Asked for someone to check my proof, question got closed for "not enough detail" lol.

Now you can see the proof in my blog post.

See:

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