bio | website | mathoverflow.net/users/19885/… |
---|---|---|
location | Between Two Moments | |
age | ||
visits | member for | 3 years, 6 months |
seen | Jun 27 at 10:30 | |
stats | profile views | 2,489 |
$T$. $S$. $Eliot$, Introduction to Dante's Inferno: " Hell is a place where nothing connects with nothing. "
$Johann$ $von$ $Neumann$: " In mathematics you don't understand things, You just get used to them. "
$A$. $A$. $Zinoviev$: " Where there are problems, there is life. "
$P$. $R$. $Halmos$: "I do believe that problems are the heart of mathematics, and I hope that as teachers, in the classroom, in seminars, and in the books and articles we write, we will emphasize them more and more, and that we will train our students to be better problem-posers and problem-solvers than we are. "
$Shahrooz$: " Physics is mirror front of universe, but mathematics is the rules of reflection. "
Jun 27 |
comment |
Can I find the gap between the two least eigenvalues of this special matrix A(t)?
@Tgh, can you give us some numerical results about your question? |
Jun 26 |
answered | How many triangles can a connected graph with $n$ vertices and $m$ edges have? |
Jun 14 |
answered | How networks with high largest eigenvalues are more robust? |
Jun 8 |
comment |
Is there exist postive integer $x,y,z,w,n$ and $k$ such $x^{n},y^{n+k},z^{n+3k},w^{n+5k}$ be geometric sequence
Yes, let $x=y=z=w=1$ which is arithmetic progression with $d=0$ and $n$ and $k$ be arbitrary integer, and you get geometric sequence with $q=1$. Can you say a little about your problem and your motivation? |
Jun 7 |
comment |
Existence of finite set of points in the revolving circles
Nice animation dear Joseph, thanks. |
Jun 7 |
revised |
Existence of finite set of points in the revolving circles
I added a weaker version of the question. |
May 30 |
comment |
Existence of finite set of points in the revolving circles
I mean $C$ contain strictly the point $x$, i.e, I like the interior case. |
May 30 |
asked | Existence of finite set of points in the revolving circles |
Dec 18 |
comment |
Open problems with monetary rewards
Dear Voloch, I think you are right. But it is a little strange for me, why mathematicians should forget the heritage of the great mathematician like MacWiliams? It is just $10$ dollar, and I think someone must accept it and pay it in the future. If I can pay, I will accept it, maybe a good news. |
Dec 17 |
answered | Open problems with monetary rewards |
Dec 11 |
awarded | Yearling |
Nov 14 |
awarded | Nice Answer |
Nov 5 |
answered | Math books for advanced high school students |
Sep 16 |
revised |
Non-DS circulant graphs
added 337 characters in body |
Sep 16 |
comment |
Non-DS circulant graphs
In general, the answer is no, even for special type of graphs. |
Sep 16 |
answered | Non-DS circulant graphs |
Aug 25 |
answered | Largest eigenvalue adjacency matrix-link deletion |
Aug 14 |
comment |
For integers $a \ge b > 1$ is $f(a,b) = a^b + b^a$ injective?
Since nobody answered the question until now (after 8 vote), it seems that it is hard. But where am I wrong? Let $a=b+x$, so for every fixed $b$, the function $f_b(x)=(b+x)^b+b^{b+x}$ is increasing in variable $x$. So induction on $b$ must solve the problem. |
Aug 13 |
revised |
Cospectrality and dimension of graphs
Corrected a mistake |
Aug 12 |
answered | Cospectrality and dimension of graphs |