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Boris Ettinger, Hans Lindblad, A sharp counterexample to local existence of low regularity solutions to Einstein equations in wave coordinates, Annals of Mathematics, SECOND SERIES, Vol. 185, No. 1 ...
We present a counterexample to the conjecture by Orlik that the restriction of a free hyperplane arrangement to one of its hyperplanes is free. This monthly journal, begun in 1950, is devoted entirely ...