Abstract We establish an asymptotic formula for the eigenvalues of a 2×2documentclass12pt{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} begin{document}$$2 times 2$$end{document}-system of ordinary differential equations provided with separated boundary conditions when the coefficients are (possibly singular) continuous, real, and finite measures.
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