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arXiv 1108.3000math.CO
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最多27行的简单排列

Simplicial arrangements with up to 27 lines

Michael Cuntz

摘要:

我们计算了实射影平面中最多27条直线的单纯形排列的所有同构类。结果表明,Grünbaums目录是完整的27行,除了四个新的安排,分别为22,23,24,25行。作为一个副产品,我们分类的伪线与多达27条线的单纯安排。特别是,我们反驳了Grünbaums猜想的不可伸展安排最多16线,并证明了猜想,任何单纯安排最多14伪线是可伸展的。

英文摘要:

We compute all isomorphism classes of simplicial arrangements in the real projective plane with up to 27 lines. It turns out that Grünbaums catalogue is complete up to 27 lines except for four new arrangements with 22, 23, 24, 25 lines, respectively. As a byproduct we classify simplicial arrangements of pseudolines with up to 27 lines. In particular, we disprove Grünbaums conjecture about unstretchable arrangements with at most 16 lines, and prove the conjecture that any simplicial arrangement with at most 14 pseudolines is stretchable.

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