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Mathematics professor at Cambridge

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awarded  Popular Question
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awarded  Yearling
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Jul
8
revised Nonexistence of an approximately distance-preserving map between discrete cubes
added 779 characters in body
Jul
8
comment Nonexistence of an approximately distance-preserving map between discrete cubes
You're right about projection on to the first $n-1$ coordinates. Actually, the case that I'm really interested in is $n/2$ dimensions. In an hour or so I'll modify the question accordingly.
Jul
8
asked Nonexistence of an approximately distance-preserving map between discrete cubes
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25
awarded  Excavator
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25
awarded  Enlightened
Jun
22
comment Are there very strongly pseudorandom permutations?
I think I've now found a construction that does what I want.
Jun
20
comment Are there any good websites for hosting discussions of mathematical papers?
I think you can make contributions by registering directly with the site, and anybody can read it. But Google Plus is a particularly convenient way of contributing, since all you have to do is write a normal post and add the #spnetwork hashtag. In due course other social networks will be added, but Google Plus has the advantage that public posts are genuinely public.
Jun
20
comment Are there very strongly pseudorandom permutations?
Actually, scratch that -- I miscalculated the information-theoretic bound, which gives that exponentially many would be needed.
Jun
19
awarded  Nice Answer
Jun
19
awarded  Necromancer