On singularities arising from the contraction op the minimal section of a ruled surface |
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| Authors: | Fumio Hidaka Masataka Tomari |
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| Institution: | (1) Hokkaido College of Sensyu University, Bibai, 079-01 Hokkaido, Japan;(2) Institute of Mathematics, University of Tsukuba, 305 Tsukuba, Japan |
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| Abstract: | We will discuss the Gorenstein property of the singularity which is blown down from the minimal section of a ruled surface in terms of the extension class. In the case that the base field has positive characteristic, we find a new example (3.4) of Gorenstein singularity in connection with Theorem B. |
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