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    Perfect single error-correcting codes in the Johnson Scheme

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    Delsarte conjectured in 1973 that there are no nontrivial pefect codes in the Johnson scheme. Etzion and Schwartz recently showed that perfect codes must be k-regular for large k, and used this to show that there are no perfect codes correcting single errors in J(n,w) for n <= 50000. In this paper we show that there are no perfect single error-correcting codes for n <= 2^250.Comment: 4 pages, revised, accepted for publication in IEEE Transactions on Information Theor

    World reactions to the 1961 Paris Pogrom

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    On 17 October 1961 a peaceful protest of Algerians in Paris, against a night-time curfew which applied only to them, was organised by the Féderation de France of the Front de Libération National (FLN), near the end of its guerrilla war against the French authorities in Algeria (1954-1962). The march was brutally repressed by the police, with somewhere in the region of 200 fatalities. Long a taboo subject in France, these events have recently been the subject of public controversy, notably during the 1997-98 trial of Maurice Papon, the Paris prefect of police in 1961, for crimes carried out during the Second World War; and in Papon's unsuccessful 1999 libel action against the author of a prominent book on the 1961 massacre, Jean-Luc Einaudi.2 This article aims to investigate the neglected subject of international responses to the 1961 massacre
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