We prove that for p prime and sufficiently large, the number of subset of Z(p) free of solutions of the equation x + y = z (that is, free of Schur triples) satisfies 2([(p-2)/3])(p-1)(1+O(2(-epsilon 1 p)))less than or equal to\SF[Z(p)]\ less than or equal to 2(p/2-epsilon 2 p), where epsilon(1) and epsilon(2) are positive absolute Constants. (C) 2002 Elsevier Science.
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Moscow MV Lomonosov State Univ, Fac Computat Math & Cybernet, Moscow 119992, RussiaMoscow MV Lomonosov State Univ, Fac Computat Math & Cybernet, Moscow 119992, Russia
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Moscow MV Lomonosov State Univ, Fac Computat Math & Cybernet, Moscow 119992, RussiaMoscow MV Lomonosov State Univ, Fac Computat Math & Cybernet, Moscow 119992, Russia
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Moscow MV Lomonosov State Univ, Dept Computat Math & Cybernet, Moscow, RussiaMoscow MV Lomonosov State Univ, Dept Computat Math & Cybernet, Moscow, Russia
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Tel Aviv Univ, Sch Math Sci, IL-69978 Tel Aviv, IsraelTel Aviv Univ, Sch Math Sci, IL-69978 Tel Aviv, Israel
Alon, Noga
Balogh, Jozsef
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Univ Illinois, Dept Math, Urbana, IL 61801 USATel Aviv Univ, Sch Math Sci, IL-69978 Tel Aviv, Israel
Balogh, Jozsef
Morris, Robert
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IMPA, Rio De Janeiro, RJ, BrazilTel Aviv Univ, Sch Math Sci, IL-69978 Tel Aviv, Israel
Morris, Robert
Samotij, Wojciech
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Tel Aviv Univ, Sch Math Sci, IL-69978 Tel Aviv, Israel
Trinity Coll, Cambridge CB2 1TQ, EnglandTel Aviv Univ, Sch Math Sci, IL-69978 Tel Aviv, Israel