bio  website  math.haifa.ac.il/~seva 

location  Israel  
age  52  
visits  member for  4 years, 6 months 
seen  9 hours ago  
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21h

awarded  Necromancer 
1d

awarded  additivecombinatorics 
1d

awarded  nt.numbertheory 
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comment 
Ordering subsets of the cyclic group to give distinct partial sums
Hmmm... All the coefficients being even means that $P$ is the zero polynomial in ${\mathbb F}_2$, which is wrong? 
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comment 
Ordering subsets of the cyclic group to give distinct partial sums
@David: Do you mean the coefficient of $x_1^5\ldots x_5^5$? Well, quite possible. What are the coefficients of $x_1^5\ldots x_6^5/x_i^5$ for $1\le i\le 5$? 
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comment 
Ordering subsets of the cyclic group to give distinct partial sums
@David: No typo (which is pretty unusual for me). We need $a_i+\ldots+a_j$ to be distinct from $0$ only for $1<i<j\le k$. 
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answered  Ordering subsets of the cyclic group to give distinct partial sums 
Apr 14 
comment 
Ordering subsets of the cyclic group to give distinct partial sums
Is there a simple proof for the real case? That is, given a set of $k$ nonzero real numbers, can we order them so as to have all the partial sums $a_1+\dotsb+a_i\ (1\le i\le k)$ pairwise distinct? 
Apr 13 
awarded  Notable Question 
Apr 8 
awarded  Nice Answer 
Apr 3 
revised 
Element with unique representation in A+B
added 1947 characters in body 
Apr 2 
revised 
Element with unique representation in A+B
edited tags 
Apr 2 
answered  Element with unique representation in A+B 
Mar 18 
revised 
On a problem about $GF(2)^n$
Grammar, notation, tags edited. 
Mar 18 
answered  On a problem about $GF(2)^n$ 
Mar 8 
accepted  Cyclotomic integers with given modulus 
Mar 7 
awarded  Revival 
Mar 6 
answered  Cyclotomic integers with given modulus 
Feb 27 
comment 
Optimal covering
It might be helpful to restate your problem in the following spirit: find an (easily computable) function $f\colon\{0,1\}^k\to\{0,1\}^{k+l}$ such that ${\rm Im}\,f+B_r=\{0,1\}^{k+l}$, where $B_r$ is the origincentered unit ball of radius $r$. The dependence of $l$ and $r$ on $k$ must be stated very explicitly. 
Feb 26 
answered  Pollard's inequality modulo a composite number 