标题： 关于二维有限间隙势薛定谔算子和Dirac算子具有奇异谱曲线的情形 显示英文标题

标题： On two-dimensional finite-gap potential Schrodinger and Dirac operators with singular spectral curves

摘要： 我们描述了二维的有限隙（在某一能量级）且具有奇异谱曲线的势Schrodinger算子和Dirac算子。事实表明，这些奇异点可以相当复杂。这样的Dirac算子出现在浸入三维空间的环面的谱曲线上。 显示英文摘要

摘要： We describe two-dimensional potential Schrodinger and Dirac operators which are finite-gap at one energy level and have singular spectral curves. It appears that the singularities can be rather complicated. Such Dirac operators appear as the spectral curves of tori immersed into the three-space.