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On the Equation n_1n_2= n_3n_4 Restricted to Factor Closed Sets
Authors:San Ying SHI  Michel WEBER
Institution:1. School of Mathematics, Hefei University of Technology, Hefei 230009, P. R. China;2. IRMA, UMR 7501, 7 rue René Descartes, 67084 Strasbourg Cedex, France
Abstract:We study the number of solutions N(B, F) of the diophantine equation n1n2=n3n4, where 1 ≤ n1B, 1 ≤ n3B, n2, n4F and F?1, B] is a factor closed set. We study more particularly the case when F={m=p1ε1pkεk, εj ∈ {0, 1}, 1 ≤ jk}, p1,…, pk being distinct prime numbers.
Keywords:Diophantine equation  arithmetical functions  factor closed set  
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