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bio website math.haifa.ac.il/~seva
location Israel
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2d
comment Differences of consecutive ordered fractional parts
@Clark Kimberling: I expanded my answer a little to address the general case of $h\ne 0$. Does this answer your question?
Jul
1
revised Differences of consecutive ordered fractional parts
added 545 characters in body
Jul
1
comment When are the powers of 2 sum-free mod n?
What are the values of $n$ smaller than, say, $100$, with the property in question? What does OEIS say?
Jun
30
revised Differences of consecutive ordered fractional parts
Typo fixed
Jun
30
answered Differences of consecutive ordered fractional parts
Jun
1
awarded  Revival
May
31
revised When is $1+a+a^2+\dotsb+a^{{\rm ord}_n(a)-1}$ divisible by $n$?
deleted 45 characters in body; edited title
May
30
answered When is $1+a+a^2+\dotsb+a^{{\rm ord}_n(a)-1}$ divisible by $n$?
May
28
revised Sumsets and dilates: does $|A+\lambda A|<|A+A|$ ever hold?
Just fixing (some) typos
May
28
accepted Sumsets and dilates: does $|A+\lambda A|<|A+A|$ ever hold?
May
28
revised Sumsets and dilates: does $|A+\lambda A|<|A+A|$ ever hold?
added 288 characters in body
May
27
asked Sumsets and dilates: does $|A+\lambda A|<|A+A|$ ever hold?
May
26
comment When is $1+a+a^2+\dotsb+a^{{\rm ord}_n(a)-1}$ divisible by $n$?
As a very basic observation, you have $S_n(\bar a)=0$ provided that both $a$ and $a-1$ are co-prime with $n$.
May
25
awarded  Necromancer
May
22
awarded  Revival
May
22
revised Minimal “sumset basis” in the discrete linear space $\mathbb F_2^n$
added 39 characters in body
May
22
revised Minimal “sumset basis” in the discrete linear space $\mathbb F_2^n$
added 23 characters in body; edited tags
May
22
answered Minimal “sumset basis” in the discrete linear space $\mathbb F_2^n$
May
7
awarded  Nice Answer
May
4
comment Vertex expansion of the Hamming graph
@Gordon Royle: seems you are right about the terminology. The graph in my answer is rather called the lattice graph, or the grid graph.