New families of highly neighborly centrally symmetric spheres
New families of highly neighborly centrally symmetric spheres
复制标题
高度邻接中心对称球体的新族
DOI:
10.1090/tran/8631
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发表时间:
2022
影响因子:
1.3
通讯作者:
Zheng, Hailun
中科院分区:
文献类型:
--
作者:
Novik, Isabella;Zheng, Hailun
Jockusch [J. Combin. Theory Ser. A 72 (1995), pp. 318–321] constructed an infinite family of centrally symmetric (cs, for short) triangulations of $3 $-spheres that are cs-$2 $-neighborly. Recently, Novik and Zheng [Adv. Math. 370 (2020), 16 pp.] extended Jockusch’s construction: for all $ d $ and $ n> d $, they constructed a cs triangulation of a $ d $-sphere with $2 n $ vertices, $\Delta^ d_n $, that is cs-$\lceil d/2\rceil $-neighborly. Here, several new cs constructions, related to $\Delta^ d_n $, are provided. It is shown that for all $ k> 2$ and a sufficiently large $ n $, there is another cs triangulation of a $(2k-1) $-sphere with $2 n $ vertices that is cs-$ k $-neighborly, while for $ k= 2$ there are $\Omega (2^ n) $ such pairwise non-isomorphic triangulations. It is also shown that for all $ k> 2$ and a sufficiently large $ n $, there are $\Omega (2^ n) $ pairwise non-isomorphic cs triangulations of a $(2k-1) $-sphere with $2 n $ vertices that are cs-$(k-1) $-neighborly. The constructions are based on studying facets of $\Delta^ d_n $, and, in particular, on some necessary and some sufficient conditions similar in spirit to Gale’s evenness condition. Along the way, it is proved that Jockusch’s spheres $\Delta^ 3_n $ are shellable and an affirmative answer to Murai–Nevo’s question about $2 $-stacked shellable balls is given. References
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影响因子:
1.4
作者:
Eran Nevo;F. Santos;Stedman Wilson
通讯作者:
Stedman Wilson
DOI:
10.1007/978-3-030-52200-1_22
发表时间:
2020-06-06
期刊:
Mathematical Software – ICMS 2020
影响因子:
--
作者:
Macchia A;Wiebe A
通讯作者:
Wiebe A
影响因子:
1
作者:
Ido Shemer
通讯作者:
Ido Shemer
影响因子:
0.8
作者:
Arnau Padrol
通讯作者:
Arnau Padrol
影响因子:
0.8
作者:
N. Linial;I. Novik
通讯作者:
I. Novik