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comment Factoring a multiset into a product of two multisets
In integer case, this problem is some kind of generalization of the factoring of an integer and I think it is much harder than factorization of a number. Let $S=\{n\}$, where $n$ is the product of two prime numbers $p$ and $q$ and let $m=n=1$. This nice problem can be used to define generalized $RSA$ cryptosystem. Anyway, I want to go to sleep.
Feb
7
answered Numerical invariants for a graph or its complement that are bounded by some constant
Jan
30
answered Characterization of non-isomorphic graphs but isomorphic total graphs?
Jan
28
comment How many solutions does $\frac{1}{x_1}+\frac{1}{x_2}+\cdots +\frac{1}{x_n}=1$ have?
an upvote because of new (group theoretic) view.
Jan
28
comment How many solutions does $\frac{1}{x_1}+\frac{1}{x_2}+\cdots +\frac{1}{x_n}=1$ have?
@Tito Piezas: Ok, thanks!
Jan
28
revised How many solutions does $\frac{1}{x_1}+\frac{1}{x_2}+\cdots +\frac{1}{x_n}=1$ have?
Some Mistakes corrected.
Jan
28
answered How many solutions does $\frac{1}{x_1}+\frac{1}{x_2}+\cdots +\frac{1}{x_n}=1$ have?
Jan
28
answered Spectral radius of perturbed bipartite graphs
Jan
28
revised Spectral radius of perturbed bipartite graphs
some corrected done.
Jan
28
suggested approved edit on Spectral radius of perturbed bipartite graphs
Jan
20
comment The parity of the full automorphism group order of finite non-abelian groups of prime exponent
Also, 32000 groups of order $5^7$ is tested and there is not such example. Only one group with odd order automorphism exist, but the exponent of this group is $125$.
Jan
19
comment The parity of the full automorphism group order of finite non-abelian groups of prime exponent
I was an upvoter. Since, I believe it is important that a problem being in a research level. The discussion will happen after asking such questions.
Jan
19
comment reverse definition for magic square
@Scipi: I pointed it out since if you see "CRC Handbook of mathematics-2ed", after introducing this subject, it gives some keywords for more research about similar problems. In some texts, when they talk about similar problems, they also talk about antimagic matrix problem.
Jan
16
revised reverse definition for magic square
Improved answer
Jan
16
answered reverse definition for magic square
Jan
16
comment reverse definition for magic square
@Meysam: can you say how you obtained the answer for $n=6$?
Jan
16
revised reverse definition for magic square
Improving the style of writing and correcting some spelling.
Jan
16
suggested approved edit on reverse definition for magic square
Jan
7
answered diameter of Cayley graphs
Jan
5
comment Factorial-based constant
I can see your private talk, please encrypt it! :)