We investigate the existence of principal eigenvalues (i.e., eigenvalues corresponding to positive eigenfunctions) the boundary value problem class="mathimg" src="/content/inline/1687-2770-2012-44-i1.gif" alt="
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机译：我们调查主特征值（即与正特征函数相对应的特征值）边界值问题的存在 class =“ mathimg” src =“ / content / inline / 1687-2770-2012-44-i1.gif” alt =“
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