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Category Archives: algorithms
Counting coins
This afternoon, Matt Locke tweeted the following problem from his nineyearold daughter’s maths homework:
Posted in algorithms, Mathematics
14 Comments
Revisiting “On editing text”
This document is an incomplete draft. About two years ago I wrote about a categorytheoretic treatment of collaborative text editing. That post is unique in the history of Bosker Blog in having been cited – twice so far that I know … Continue reading
Posted in algorithms, category theory, Mathematics
2 Comments
The bicycle lock problem
Don’t lock your bicycle with a combination lock. Someone will steal it: I learnt this the hard way. It’s quite easy to open a combination lock by feel, without knowing the combination. Try it: with a bit of practice, you … Continue reading
Posted in algorithms, Mathematics
4 Comments
Beyond Bézier curves
There is a new feature of Pages and Keynote, not mentioned in any of Apple’s publicity nor in any press coverage I’ve seen, that is really very interesting. Perhaps it will even one day prove to have been revolutionary, in … Continue reading
“Venn diagram” partitioning
Paddy3118 wrote about partitioning elements in the same way a Venn diagram does. So, if we have sets A, B and C, the partitions are
Posted in algorithms, chatter
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On editing text
Editing text is the opposite of handling exceptions; or, to put it another way, editing text is like exception handling but backwards in time. I realise this is an unexpected claim, so I hope you will permit me to explain. … Continue reading
Posted in algorithms, category theory
17 Comments
Something I don’t understand about homomorphic encryption
Added later: In retrospect, now I know a little more about cryptography, I can see that my confusion here is caused entirely by the fact that I didn’t know the meaning of the technical term “semantic security”. Ever since Craig … Continue reading
Posted in algorithms, chatter
6 Comments