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On the Ranks of Certain Semigroups of Orientation Preserving Transformations |
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| Authors: | Ping Zhao |
| Institution: | 1. Mathematics Teaching and Research Section , Guiyang Medical College , GuiZhou, Guiyang, China zhaoping731108@hotmail.com |
| Abstract: | We classify the unmixed squarefree lexsegment ideals and determine those which are Cohen–Macaulay. |
| Keywords: | Idempotent rank Order preserving transformation Orientation preserving transformation |