以下为句子列表：
英文: Abstract: The boundary-value problem of an ultra-hyperbolic equation with an integral condition is studied and existence and uniqueness of the solution are proved.
中文: 文摘:本文研究一类超双曲型方程的极限问题，提出并证明了具一积分条件的超双曲型方程的边值问题解的存在性和唯一性。
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英文: The results show that the eigenvalues of the boundary-value problem form a denumerable set, and the eigenvalue approaches infinity.
中文: 结果表明边值问题的特征值构成一个可数集，并且特征值趋向于无穷大。
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