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This is Numberphile. We mainly post videos about mathematics and just numbers in general.

An Infinite Debt - with Christopher Havens (Prisoner #349034)

Christopher Havens is serving a 25-year prison sentence for murder - but behind bars he's seeking redemption through advanced mathematics.

He has published an academic paper... and is bringing math to other inmates via The Prison Mathematics Project.

Catch this episode on YouTube

The Prison Mathematics Project

The Paper: Linear fractional transformations and non-linear leaping convergents of some continued fractions

Article by Marta Cerruti on The Conversation

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With thanks to MSRI

The First and Last Digits of Pi

The Little Star - with Zvezdelina Stankova