Indisputable Existence of Santa Claus

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How do you apply game theory to select who should be on your Christmas shopping list ? Can you predict Her Majesty''s Christmas Message? Will calculations show Santa is getting steadily thinner - shimmying up and down chimneys for a whole night - or fatter - as he tucks into a mince pie and a glass of sherry in billions of houses across the world?

Full of diagrams, sketches and graphs,...