Small covers over products of a simple polytope with a simplex

Small covers over products of a simple polytope with a simplex
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简单多胞形与单纯形的乘积的小覆盖

DOI:
10.3906/mat-1610-97
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发表时间:
2018-03
期刊:
Turkish Journal of Mathematics(2017.6.16录用证明及全文,已在线)
影响因子:
--
通讯作者:
Yanying Wang
Yanying Wang
中科院分区:
其他
文献类型:
--
作者:
Wei Dai;Yanying Wang

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证明了具有n -单纯形的简单多面体积上的小覆盖数在D-J等价下是变量2上的多项式。类似的结果也适用于可定向的小覆盖物。我们还提供了一种新的计算方法,即计算有限个数的代表和多项式插值。给出了可定向小盖数与小盖数之比。作为一个应用,我们利用插值法确定了具有D-J等价的单纯形的棱镜积上的小覆盖层和可定向小覆盖层的多项式。还提供了计算乘积上小覆盖的等变同胚类的数目的公式。
This paper proves that the number of small covers over products of a simple polytope with a n -simplex, up to D-J equivalence, is a polynomial in the variable 2 . A similar result holds for orientable small covers. We also provide a new way of computation, namely computing the finite number of representatives and interpolating polynomially. The ratio between the number of orientable small covers and the number of small covers is given. As an application, by interpolation, we determine the polynomials related to small covers and orientable small covers over products of a prism with a simplex up to D-J equivalence. A formula for calculating the number of equivariant homeomorphism classes of small covers over the product is also provided.
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