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DEMONSTRATIO MATHEMATICAVol. XXVIINo 21994B. P. PachpatteON MULTIVARIATE GREENE TYPE INEQUALITIESIn the present paper we establish a new integral inequality of the Greenetype involving functions of several variables. A corresponding inequality onthe discrete analogue of the main result is also given.1. IntroductionIn 1977, D. E. Greene [3] proved the following lemma.L E M M A 1.be continuousLet k\, k2 and // be nonnegative constants and let f , g and hinonnegative functions for all t > 0 with hi bounded such thaif(t)<k!+tJ h1(s)f(s)ds0g(t)<k2+t+ fe^h2(s)g(s)ds,0tf e-f°h3(s)f(s)ds+f00th4(s)g(s)ds,for all t > 0. Then there exist constants Ci and Mi such that/(<)<^ieClt,g(t)<M2ec^,for all t > 0.The proof of these inequalities given in [3] was elementary but long, andmuch shorter proofs and further generalizations were found in [2], [8], [12].In 1957, while investigating the boundedness of solutions of certain secondorder differential equations, Liang Ou-Iang [7] established the following inequality.A MS (MOS) Subject Classification (1980): Primary 26D15, Secondary 26D20.Keywords and phrases: Greene type inequalities, several variables, discrete analogue,Sum-difference equations.302B. P. P a c h p a t t eLet u and p be real-valued nonnegative continuous functionsdefined for all t>0. Iftu2(t) < c2 + 2 fp(s)u(s)ds,0for all t > 0, where c > 0 is a
Demonstratio Mathematica – de Gruyter
Published: Apr 1, 1994
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