bio | website | math.haifa.ac.il/~seva |
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location | Israel | |
age | 53 | |
visits | member for | 4 years, 10 months |
seen | 5 hours ago | |
stats | profile views | 3,347 |
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Aug
27 |
comment |
Uniformly small sums of roots of unity
@Greg: I have reworked the answer, so comments made earlier seem irrelevant now. You can just delete them if you agree. |
Aug
27 |
revised |
Uniformly small sums of roots of unity
added 568 characters in body |
Aug
26 |
comment |
What is the maximum size of a set system where the intersection of any two incomparable members is not in the set?
The concluding part of your argument is a little vague and in fact, it seems that you can add an arbitrarily chosen set of size larger than $t+1$ to the family of all $(t+1)$-sets while keeping the property in question. (Think, for instance, of the set $[n]$ itself.) |
Aug
20 |
accepted | Smoothening a measure, II |
Aug
20 |
revised |
Smoothening a measure, II
added 99 characters in body |
Aug
19 |
asked | Smoothening a measure, II |
Aug
19 |
accepted | Smoothening a probability measure |
Aug
19 |
revised |
Smoothening a probability measure
rolled back to a previous revision |
Aug
19 |
revised |
Smoothening a probability measure
added 276 characters in body |
Aug
19 |
asked | Smoothening a probability measure |
Aug
13 |
comment |
Maximal Number of Pairs of Orthogonal vectors in a set of $n$ vectors in $\mathbb{R}^3$
I wonder whether this correspondence works for the finite vector space ${\mathbb F}_q^r$. Assuming we have a system of $n$ points and $l$ lines in ${\mathbb F}_q^r$ that determines $I$ incidences, how many points we get in ${\rm PG}(r,q)$ and how many pairs of them will be orthogonal? |
Jul
6 |
answered | Uniformly small sums of roots of unity |
Jul
3 |
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 $n$? |