Niche number four
نویسندگان
چکیده
منابع مشابه
"four-and-twenty, Twenty-four". What's in a Number?
This paper investigates "what's in a number", i.e. how natural numbers are pronounced in several European languages. As regards reading numbers above 20, 29 languages read the decade first and then the digit, e.g. twenty-four, and 10 languages read the digit before the decade, e.g. four-and-twenty. Two languages, Norwegian and Czech, use both systems, and 9 languages use (partly) a vigesimal sy...
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For a knot K in the 3-sphere, by using the linking form on the first homology group of the double branched cover of the 3-sphere, we investigate some numerical invariants, 4-genus g∗(K), nonorientable 4-genus γ∗(K) and 4dimensional clasp number c∗(K), defined from the four-dimensional viewpoint. T. Shibuya gave an inequality g∗(K) ≤ c∗(K), and asked whether the equality holds or not. From our r...
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Many brain regions have been implicated in memory performance, but the relationship between memory capacity and neural activity has not been clear. Recent studies show that activity in the posterior parietal cortex increases with working memory load, implicating this region in the storage of representations in visual memory.
متن کاملThe Kissing Number in Four Dimensions
The kissing number τn is the maximal number of equal size nonoverlapping spheres in n dimensions that can touch another sphere of the same size. The number τ3 was the subject of a famous discussion between Isaac Newton and David Gregory in 1694. The Delsarte method gives an estimate τ4 ≤ 25. In this paper we present an extension of the Delsarte method and use it to prove that τ4 = 24. We also p...
متن کاملUniform Intersecting Families with Covering Number Four
Let X be a finite set. We denote by (~) the family of all k-element subsets of X. A family ~satisfying ~ c (~) is called k-uniform. The vertex set of @ is X and it is often denoted by V(Y). An element of ~ is also called an edge of J~. The family ~ is called intersecting if Fc~ G ¢ 25 holds for every F, G ~ ~ . A set C c X is called a cover (or transversal set) of Y if it intersects every edge ...
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ژورنال
عنوان ژورنال: Computers & Mathematics with Applications
سال: 1996
ISSN: 0898-1221
DOI: 10.1016/0898-1221(96)00176-9