Having read Professor Stewart's excellent Cabinet of Curiosities, I was keen to read more about Radon Transforms and their applications which which this article achieves admirably. Thank you! Malcolm Golland, Potters Bar, England

PS Read while listening to a radio broadcast of an excellent performance of Bach's B Minor Mass from London's Royal Albert Hall. What a combination - my two passions in life viz. Mathematics and Music - marvellous!

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