Authors: Zhicheng Yu
When I study some basic geometry,sometimes double lines are at the same place,how to show it in the picture?How about a minus line?When I study a little algebraic geometry,specially the algebraic curve,I find that is just the divisor.The set is a better stage for the divisor and I call it S-divisor.
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[v1] 2013-09-05 06:51:45
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