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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
3k views

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 …
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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 …
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  • 2,089
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 …
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  • 2,089
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 …
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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 …
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  • 2,089
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 …
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  • 2,089
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 …
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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 …
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  • 2,089
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 …
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  • 2,089
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 …
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  • 2,089
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 …
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  • 2,089
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 …
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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= …
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  • 2,089
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, …
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