On sets of integers which are both sum-free and product-free.
Пнд, 01/09/2012 - 15:01 — SomNambul
link: http://arxiv.org/abs/1201.1317
Abstract
Abstract
We consider sets of positive integers containing no sum of two elements in
the set and also no product of two elements. We show that the upper density of
such a set is strictly smaller than 1/2 and that this is best possible.
Further, we also find the maximal order for the density of such sets that are
also periodic modulo some positive integer.
Вход в систему
Loading
Bi Shan
Втр, 01/10/2012 - 10:14 — Bi ShanMoncler outlet
The jackets are quilted and filled with 100% decrease filling for satisfactory safety throughout winters. Moncler jackets for men could be the plenty of acclaimed cast with abundant coat. We are international trade that specializes in the Moncler Jackets.
True Religion Jeans Outlet
We are international trade that specializes in the True Religion Jeans on sale. The latest styles of True Religion Jeans are on large sales now. The originator of ture religion is the Levi’s Company.
Christian Louboutin Shoes
The high heels will not be harmful to our health.The latest styles of Christian Louboutin shoes are on large sales now! There are so many high heels on the street. In fact, the Christian Louboutin have an effect on our health and body shape.
MBT shoes outlet
The latest styles of MBT sport shoes are on large sales now.We serve you MBT health shoes. MBT sport shoes gets different kinds of color—black, white, chocolate, silvery and so on.
lancel
Пт, 02/10/2012 - 07:11 — lancelfait partie de ce que vous devriez chercher lors de sac lancel votre purchase1 "x 8de nombreux sacs imitation brandname peut être trouvée.
Mon partenaire et moi normalement pensé qui concernent exactement le sac brigitte bardot même droit jusqu'à l'élément qui m'a frappé finalement pour elle caractéristique durable et de la soldes sacs mode l'anneau en D pour accrocher les clés et les sachets un musée de la mode à Paris qui abrite des expositions et des collections de la mode franaise et le costume du 18ème siècle à nos jours y compris des solde sac vêtements appartenant à nouvel entrasacs lancel air d'élégance pour le porteur qui rend ces l'un des meilleurs cadeaux d'anniversaire pour elle.
L'idée est de garder en lieu s? La question viendra naturellement être directement dans si nous parlons de lancel, Lancel sac porte-monnaie damier.
http://www.sac-boutique.com/
gucci uk
Втр, 02/14/2012 - 06:45 — outletonlineI love how many beautiful thing gucci uk has. They are a great touch of elegance for any home. Browse this lens to see some of what they have.gucci outlet can provide the gucci exactly the same is expected in a retail store. It can help you find bags of various colors, shapes and designs, which prove once again that the gucci is actually a selection for the housekeeper.
louis vuitton outlet
Втр, 02/14/2012 - 06:58 — outletonlineLooking for a louis vuitton outlet and don't know where they are? The easiest way is to enter here. That simple and you definitely will never be disappointed.
coach factory outlet
Втр, 02/14/2012 - 07:16 — outletonlinecoach factory outlet uses graceful accessories to match the classical logo of coach, which is the best combination of coach. The handmade coach products?can make you more charming and graceful.in the market you definitely can find various colorways that are designed in as well as the high quality that applied in. For most of you would like to come. So just come to our coach factory outlet online store to choose one.
coach factory online
Втр, 02/14/2012 - 07:27 — outletonlineWould you like to meet more friends, or go with the times? If yes, coach factory online is opening welcome doors to you.My coworkers often buy handbags, jewelry and other accessories at coach factory outlets. They also visit the front page of Coach outlet online.