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Comparison Theorems for Special Classes of Nonselfadjoint Elliptic Equations

Kurt Kreith
1974 Proceedings of the American Mathematical Society  
Known comparisons for nonselfadjoint elliptic equations are strengthened in cases where the coefficients of these equations satisfy special conditions. These improved comparison theorems are also considered in the context of a related eigenvalue problem.
doi:10.2307/2039699 fatcat:4eexyi6y3bhtlad6leg377cwui