Hay Festival, Powys, Wales - May 2015 - Mathematician and author Cedric Villani signing copies of his latest book Birth of a Theorem - A Mathematical Adventure for fans in the Hay Festival bookshop.

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Keywords: 2015, author, book, bookshop, britain, cedric, copies, festival, gb, great, hay, mathematician, powys, signing, uk, villani, wales, writer, wye