56-page book contains Turing's thoughts on tricky 'Leibniz notation dx/dy'

Perhaps NSA stands for ``Non-Standard Analysis''. Whit From: Martin Postranecky <mp@HEP.UCL.AC.UK> Subject: [BPARK] 'That equation is a real Enigma !' Rare handwritten papers by Alan Turing (fwd) Date: 11 April 2015 13:53:34 BST To: BLETCHLEYPARK@LISTSERV.KSU.EDU 11 April 2015 'That equation is a real Enigma !' Rare handwritten papers by Alan Turing set to fetch $1million at auction reveal some maths completely baffled the code-breaking genius - 56-page book contains Turing's thoughts on tricky 'Leibniz notation dx/dy' - It was written at the Bletchley Park code-breaking headquarters in 1942 - Only extensive Turing manuscript thought to exist, the auctioneer said - It will be sold by an anonymous seller by Bonhams in New York on Monday By Lydia Willgress for MailOnline and Daily Mail Reporter A handwritten notebook in which Britain's Enigma machine genius Alan Turing admits he is baffled by an equation could fetch up to $1million ( £690,000 ). The 56-page book bought in Cambridge contains Turing's thoughts on the clearly tricky 'Leibniz notation dx/dy'. 'I find [it] extremely difficult to understand in spite of it having been the one I understood the best once !' he wrote...../snip/ Read more : http://www.dailymail.co.uk/news/article-3034334/Alan-Turing-s-notebook-set-f... http://www.bonhams.com/press_release/18431/