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 books.google.com [13] Y. Bilu, Sumfree sets and related sets, Combinatorica 18 (1998) 449^59; MR
2000J: 11035. [14] N. J. ... 2.26 TripleFree Set Constants A set S of positive
integers is called doublefree if, for any integerx, the set {x, 2x} g 5. Equivalently,
S is ... 

 books.google.com Vsevolod Lev, Tomasz Luczak & Tomasz Schoen, Sumfree sets in abelian
groups, Israel J. Math., 125(2001) 347367; MR 2002i:11023. ... Edward T. H.
Wang, On doublefree set of integers, Ars Combin., 28(1989) 97100; MR 90d:
11011. 

 books.google.com DoubleFree Set A SET of POSITIVE INTEGERS is doublefree if, for any integer
x, the SET {x.2x}£S (or equivalently, xeS IMPLIES 2x$S). For example, of the
subsets of {1, 2. 3}, the sets 0, {!}. {2}, {2,3}, {1,3}, and {3} are double free, while {
1,2} ... 

 books.google.com ON MULTIPLICATIVE SIDON SETS David Wakeham Department of Mathematics
and Statistics, The University of Melbourne, ... In a similar direction, Wang [14]
defined a set S ⊆ N to be doublefree if x = 2y for all x, y∈ S, and proved that the
... 

 books.google.com First published in 1935, this novel reaffirmed James M. Cain as a virtuoso of the roman noir. From the Trade Paperback edition. 

 books.google.com But can being a double act work for ever, when so much around them is changing? This everpopular story now includes an extraspecial new introduction by Jacqueline! 

 books.google.com With consummate skill and an uncanny ability to capture how real kids think, act, and feel, Tears of a Tiger author Sharon M. Draper weaves these three stories tighter and tighter, creating a novel that tingles with suspense and emotion. 

 books.google.com 1994  Snippet view %n k n>oo n m 10.4 Does the set {1,2,..., 3000} contain a subset A consisting of
2000 numbers such that x £ A implies 2x £ A ? Solution Call a set A with this
property doublefree. Consider the problem with 3000 replaced by arbitrary N.
For ... 

 books.google.com Everything's changing for our friendly neighbourhood serial killer. 

 books.google.com He embarks on a secret quest to find his double and sets in motion a train of events that he cannot control. 

 