利用谱曲线的方法研究了一类带有不定权函数的高阶奇异左定微分算子的谱,结果表明,自伴边界条件的高阶奇异左定微分算子有可数多个特征值,而且均为实数,上下无界,算子的特征值可以排序为…≤λ-2≤λ-1≤λ-0〈0〈0λ≤1λ≤2λ≤…
The spectrum of a class of high-order singular leftdefinite differential operators is studied. Based on the method of "spectrum-curves",a conclusion is obtained. If a high-order differential operator with a self-adjoint boundary condition is left-definite and right-indefinite, then, all its eigenvalues are real, countable, infinite, and they are unbounded from blow and from above and can be indexed to satisfy the inequality…≤λ-2≤λ-1≤λ-0〈0〈0λ≤1λ≤2λ≤…