For any elliptic normal surface singularity with rational homology sphere link we consider a new elliptic sequence, which differs from the one introduced by Laufer and S. S.-T. Yau. However, we show that their length coincide. Using the properties of both sequences we succeed to connect the common length with the geometric genus and also with several topological invariants, e.g. with the Seiberg--Witten invariant of the link.

中文翻译：

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关于椭圆奇点的拓扑

对于任何具有有理同源球链的椭圆法向表面奇点，我们考虑一个新的椭圆序列，它不同于 Laufer 和 SS-T 引入的序列。悠。然而，我们表明它们的长度是一致的。使用这两个序列的特性，我们成功地将公共长度与几何属以及几个拓扑不变量（例如链接的 Seiberg-Witten 不变量）连接起来。