منابع مشابه
Cameron-Liebler line classes
New examples of Cameron-Liebler line classes in PG(3,q) are given with parameter 1 2 (q 2− 1). These examples have been constructed for many odd values of q using a computer search, by forming a union of line orbits from a cyclic collineation group acting on the space. While there are many equivalent characterizations of these objects, perhaps the most significant is that a set of lines L in PG...
متن کاملDr. Archibald Cameron.
AMONG TE lives of the many men and women who have been qualified to practise the art of medicine are a number who have moved from that discipline into others where they have made a name and reputation for themselves which they might not have attained to had they remained loyal to their first choice: yet they have brought to their other work something which they learned in the days when their fi...
متن کاملThe Cameron–Erdős Conjecture
A subset A of the integers is said to be sum-free if there do not exist elements x, y, z ∈ A with x+y = z. It is shown that the number of sum-free subsets of {1, . . . , N} is O(2N/2), confirming a well-known conjecture of Cameron and Erdős.
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ژورنال
عنوان ژورنال: Nature
سال: 2005
ISSN: 0028-0836,1476-4687
DOI: 10.1038/438752a