ترغب بنشر مسار تعليمي؟ اضغط هنا

Eventually, geometric $(n_{k})$ configurations exist for all $n$

48   0   0.0 ( 0 )
 نشر من قبل Leah Berman
 تاريخ النشر 2021
  مجال البحث
والبحث باللغة English




اسأل ChatGPT حول البحث

In a series of papers and in his 2009 book on configurations Branko Grunbaum described a sequence of operations to produce new $(n_{4})$ configurations from various input configurations. These operations were later called the Grunbaum Incidence Calculus. We generalize two of these operations to produce operations on arbitrary $(n_{k})$ configurations. Using them, we show that for any $k$ there exists an integer $N_k$ such that for any $n geq N_k$ there exists a geometric $(n_k)$ configuration. We use empirical results for $k = 2, 3, 4$, and some more detailed analysis to improve the upper bound for larger values of $k$.



قيم البحث

اقرأ أيضاً

We define a new class of shift spaces which contains a number of classes of interest, like Sturmian shifts used in discrete geometry. We show that this class is closed under two natural transformations. The first one is called conjugacy and is obtain ed by sliding block coding. The second one is called the complete bifix decoding, and typically includes codings by non overlapping blocks of fixed length.
A factorisation $x = u_1 u_2 cdots$ of an infinite word $x$ on alphabet $X$ is called `monochromatic, for a given colouring of the finite words $X^*$ on alphabet $X$, if each $u_i$ is the same colour. Wojcik and Zamboni proved that the word $x$ is pe riodic if and only if for every finite colouring of $X^*$ there is a monochromatic factorisation of $x$. On the other hand, it follows from Ramseys theorem that, for textit{any} word $x$, for every finite colouring of $X^*$ there is a suffix of $x$ having a monochromatic factorisation.par A factorisation $x = u_1 u_2 cdots$ is called `super-monochromatic if each word $u_{k_1} u_{k_2} cdots u_{k_n}$, where $k_1 < cdots < k_n$, is the same colour. Our aim in this paper is to show that a word $x$ is eventually periodic if and only if for every finite colouring of $X^*$ there is a suffix of $x$ having a super-monochromatic factorisation. Our main tool is a Ramsey result about alternating sums that may be of independent interest.
68 - G. J. Fu , Hui Jiang , Y. M. Zhao 2010
We investigate the correlation between integrated proton-neutron interactions obtained by using the up-to-date experimental data of binding energies and the $N_{rm p} N_{rm n}$, the product of valence proton number and valence neutron number with res pect to the nearest doubly closed nucleus. We make corrections on a previously suggested formula for the integrated proton-neutron interaction. Our results demonstrate a nice, nearly linear, correlation between the integrated p-n interaction and $N_{rm p} N_{rm n}$, which provides us with a firm foundation of the applicability of the $N_{rm p} N_{rm n}$ scheme to nuclei far from the stability line.
We discuss several partial results towards proving Dennis Whites conjecture on the extreme rays of the $(N,2)$-Schur cone. We are interested in which vectors are extreme in the cone generated by all products of Schur functions of partitions with $k$ or fewer parts. For the case where $k =2$, White conjectured that the extreme rays are obtained by excluding a certain family of bad pairs, and proved a special case of the conjecture using Farkas Lemma. We present an alternate proof of the special case, in addition to showing more infinite families of extreme rays and reducing Whites conjecture to two simpler conjectures.
158 - Joseph A. Thas 2017
Let $m_2(n, q), n geq 3$, be the maximum size of k for which there exists a complete k-cap in PG(n, q). In this paper the known bounds for $m_2(n, q), n geq 4$, q even and $q geq 2048$, will be considerably improved.
التعليقات
جاري جلب التعليقات جاري جلب التعليقات
سجل دخول لتتمكن من متابعة معايير البحث التي قمت باختيارها
mircosoft-partner

هل ترغب بارسال اشعارات عن اخر التحديثات في شمرا-اكاديميا