نتایج جستجو برای: normal subset

تعداد نتایج: 651379  

2005
Van Vu

Let n be a large number. A subset A of Zn is complete if SA = Zn, where SA is the collection of the subset sums of A. Olson proved that if n is prime and |A| > 2n1/2, then SA is complete. We show that a similar result for the case when n is a composite number, using a different approach.

Journal: :Inf. Process. Lett. 2012
Eduardo C. Xavier

Consider the following problem which we call Maximum k-Subset Intersection (MSI): Given a collection C = {S1, . . . , Sm} of m subsets over a finite set of elements E = {e1, . . . , en}, and a positive integer k, the objective is to select exactly k subsets Sj1 , . . . , Sjk whose intersection size |Sj1 ∩ . . . ∩ Sjk | is maximum. In [2], Clifford and Popa studied a related problem and left as ...

Journal: :Electr. J. Comb. 1998
Tom Bohman

A set S of positive integers has distinct subset sums if there are 2|S| distinct elements of the set {∑ x∈X x : X ⊂ S } . Let f(n) = min{maxS : |S| = n and S has distinct subset sums}. Erdős conjectured f(n) ≥ c2n for some constant c. We give a construction that yields f(n) < 0.22002 · 2n for n sufficiently large. This now stands as the best known upper bound on f(n).

Journal: :IJAC 2014
Bren Cavallo Delaram Kahrobaei

In this paper we study the conjugacy problem in polycyclic groups. Our main result is that we create polycyclic groups Gn whose conjugacy problem is at least as hard as the subset sum problem with n indeterminates. As such, the conjugacy problem over the groups Gn is NP-complete where the parameters of the problem are taken in terms of n and the length of the elements given on input.

ژورنال: پژوهش های ریاضی 2022

Let G be a group. Neumann to answer a question of Paul Erdos proved that every infinite subset of G has two different comuting elements  if and only if G is center-by-finite. In this paper, we deal with Erdoschr('39')s question in different aspect and we show that every infinite subset X of G has two different elements x and y such that x^y=1  if and only if the exterior  center of G ihas finit...

Journal: :iranian journal of fuzzy systems 2015
marius tarnauceanu

in this paper a first step in classifying the fuzzy normalsubgroups of a finite group is made. explicit formulas for thenumber of distinct fuzzy normal subgroups are obtained in theparticular cases of symmetric groups and dihedral groups.

Journal: :Set-valued and Variational Analysis 2021

We obtain a characterization of the proximal normal cone to prox-regular subset Riemannian manifold and some properties Bouligand tangent cones these sets are presented. Moreover, we show that on an open neighborhood set, metric projection is locally Lipschitz it directionally differentiable at boundary points set. Finally, necessary condition for curve be minimizing in set derived.

1987
N Alon

IAl > ((l/k) + E)n then there is a subset B L A such that 0 < 1 BI 0, let snd(nt) denote the smallest integer that does not divide PI. We prove that for every I-: > 0 there is a constant c = ~(8:) z I, such that for every n > 0 and every rn, n ' +' 6 WI < n'llog'n...

Journal: :iranian journal of immunology 0
hossein asgarian department of immunology, school of public health, tehran university of medical sciences, tehran, iran mahdi shabani department of immunology, school of public health, tehran university of medical sciences, tehran, iran parvaneh vosoogh clinic of hematology, ali-asghar hospital, faculty of medicine, iran university of medical sciences, tehran, iran ramazan ali sharifian clinic of hematology and oncology, vali-asr hospital, faculty of medicine, tehran university of medical sciences, tehran, iran soheila gharagozlou department of immunology, school of public health, tehran university of medical sciences, tehran, iran jalal khoshnoodi department of immunology, school of public health, tehran university of medical sciences, tehran, iran tahereh shahrestani

background: the wilm’s tumor gene 1 (wt1) encodes a zinc finger transcription factor that is inactivated in a subset of wilm’s tumors. it plays a crucial role in growth, proliferation and development of some embryonic and adult organs. wt1 is expressed as a tumor associated antigen (taa) in various types of solid and hematopoietic malignancies and can be employed as a useful marker for targeted...

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