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May 10, 2016 at 21:07 comment added Dima Pasechnik and I found some wrong published constructions of abstract regular polytopes: arxiv.org/abs/1603.01710 (these are of course not as spectacular as the whole Italian school story :))
May 10, 2016 at 21:05 comment added Dima Pasechnik we found some apparently wrong published constructions (thought of as "classical") of Hadamard matrices: arxiv.org/abs/1601.00181
May 10, 2016 at 20:47 comment added Yemon Choi See also this part near the end: "My thinking was about results that have been undermined from below. @J.J Green's example in the comments of Italian algebraic geometry seems like the best example I have seen. The trisection and individually wrong results do not seem to grow into areas, but certainly I would find interesting any example where a flawed result had built a small industry before it was found to be wrong."
May 10, 2016 at 20:47 comment added Yemon Choi Dima, this is an interesting example, but I really don't think it meets the OP's aim as implied in the first paragraph: "The history of mathematics over the last 200 years has many occasions when the fundamental assumptions of an area have been shown to be flawed, or even wrong. Yet I cannot think of any examples where, as the result the mathematics itself had to be thrown out. Old results might need a new assumption or two. Certainly the rewritten assumptions often allow wonderful new results, but have we actually lost anything?"
May 10, 2016 at 20:20 comment added Dima Pasechnik the author cannot reconstruct the results in question; nor anyone else could. It's not "mislaid".
May 10, 2016 at 19:40 comment added Yemon Choi I still don't think this is what the OP intended - see maxwelldemon.com/2012/05/09/have-we-ever-lost-mathematics
May 10, 2016 at 19:39 comment added Dima Pasechnik well, results from a paper that one cannot reconstruct fall under lost, no?
May 10, 2016 at 19:35 comment added Yemon Choi Isn't the question about maths that had to be "thrown out" because of flaws, rather than maths which was "mislaid"?
S May 10, 2016 at 15:58 history answered Dima Pasechnik CC BY-SA 3.0
S May 10, 2016 at 15:58 history made wiki Post Made Community Wiki by Dima Pasechnik