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Enumerative combinatorics, graph theory, order theory, posets, matroids, designs and other discrete structures. It also includes algebraic, analytic and probabilistic combinatorics.
7
votes
3
answers
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Can American Math. Monthly be used to publish hard research?
My question pertains to the journal "American Mathematical monthly" published by the MAA.
I wish to ask whether a paper as a part of a PhD thesis (subject: Combinatorics ) can be submitted to the AMM. …
7
votes
1
answer
394
views
Three coloring the elements of symmetric group
Is it possible to $3$-color the elements of the symmetric group $S_n\ n\ge3$ such that all color classes have the same number of elements ($\frac{n!}{3}$); and, when elements in any color class are a …
7
votes
1
answer
271
views
When is a Schreier coset graph vertex transitive
When is a Schreier Coset graph on a group $G$ with subgroup $H$ and symmetric generating set $S$(without identity) vertex transitive?
It is well known that when $H$ is normal, the Schreier coset graph …
6
votes
1
answer
252
views
List chromatic index of a particular graph
Consider the graph $G$ of order $n$ consisting of two disjoint cliques of even order $\frac{n}{2}=p+1$ (where $p$ is odd prime) joined by a bipartite graph (that is, deleting the edges of the two di …
5
votes
0
answers
105
views
Dinitz Conjecture extension to rectangles
The Dinitz Conjecture, which was proved later in a more general form by Galvin, stated that given an $n\times n$ array, its elements could be filled exactly like a latin square, where the elements in …
4
votes
1
answer
241
views
Total coloring conjecture for Cayley graphs
The total coloring conjecture (TCC) states that any total coloring of a simple graph $G(V,E)$ has its total chromatic number bounded as $\chi^{T}(G)\le \Delta+2$ where $\Delta $ is the maximal degree …
4
votes
1
answer
764
views
Where can I find journal contents of Ars Combinatoria
In the journal website, there are table of contents available only from 1995-2019. Where can I find the table of contents before that? And, is the journal only offline through subscription? Thanks b …
4
votes
2
answers
472
views
Transposition Cayley graphs are planar
Consider the Cayley graph $G$ with vertex set the elements of the symmetric group $S_n$ and generating set the set of minimal transposition generators of the group $S_n$, that is the set $S=\{(12),(13 …
3
votes
0
answers
123
views
On Total Coloring of Regular Graphs
Consider a regular graph of order $n$ and degree $\Delta$. Now, by Brooks' theorem, we can partition the vertices into $\Delta+1$ independent sets. The extreme case of $n$ independent sets is only for …
3
votes
1
answer
296
views
Evans conjecture for symmetric latin squares
The Evans conjecture ( which was proved later by Smetaniuk) states that for any $n$, if at most $n-1$ entries of a partial $n\times n$ latin square are filled, it can be completed to the full latin s …
3
votes
1
answer
423
views
Chromatic number of square of a tree
What is an upper bound on the chromatic number of the square of a tree on $n$ vertices? Note that the power of the graph is considered in this sense.
If the tree were a path, then it is easy to see th …
3
votes
0
answers
150
views
Chromatic number of regular graphs using spectra
There exist inequalities relating the maximum and minimum eigenvalues of the adjacency matrix of a graph with its chromatic numbers, i.e. the Wilf's and Hoffmann's inequalities, which put together sta …
3
votes
1
answer
182
views
Edge coloring graphs is in P?
It is known that there exist polynomial time algorithm to approximate the Lovasz number or the supremum of Shannon capacity of graphs.
By Vizing's theorem, the graph $G$ has only two chromatic indic …
3
votes
0
answers
72
views
Hamiltonian cycles in Cayley graph on alternating group
Let $G=\operatorname{Cay}(A_n,S)$ be the Cayley graph on the Alternating group $A_n\quad n\ge4$ with generating set $S=\{(1,2,3),(1,2,4),\ldots,(1,4,2),(1,3,2)\}$. One Hamiltonian cycle in $G$ for $n= …
3
votes
1
answer
100
views
Edge coloring of a graph on alternating groups
Let $G$ be the Cayley graph on the alternating group $A_n\,n\ge4$ with generating set $$S=\begin{cases}\{(1,2,3),(1,3,2),\\(1,2,\ldots,n),(1,n,n-1,\ldots,2)\}, &n\ \text{odd}\\ \{(1,2,3),(1,3,2),\\(2, …