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Peter Smith
  • Member for 9 years, 7 months
  • Last seen more than 3 years ago
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Recently retired from Cambridge Philosophy Faculty, interested in logic and philosophy of maths.

I waste time on twitter @PeterSmith (http://twitter.com/PeterSmith/)

For more about me, see http://www.logicmatters.net/about/

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167
Why don't we define "imaginary" numbers for every "impossibility"?
64
Prove that the union of countably many countable sets is countable.
58
Fun but serious mathematics books to gift advanced undergraduates.
52
If $f(x)\leq f(f(x))$ for all $x$, is $x\leq f(x)$?
50
We all use mathematical induction to prove results, but is there a proof of mathematical induction itself?

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