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Ben Sparks is a teacher, freelance mathematician, musician and speaker http://www.bensparks.co.uk/

Where do numbers come from? A whistle-stop tour of some of the exciting bits in the development of number, from integers, rationals, irrationals, all the way to complex numbers - with some proofs and fractals thrown in... Along the way: Who killed Hippasus and why? Just why is A4 paper 297mm long? How do you know when there are -1 sheep in a field? What is the square root of -1? Why does it matter?

Is maths created by us, or are we discovering eternal truth?

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