Searcharxiv⌕ Search
Home/Archive/arXiv

arXiv · 1801.00468

On Equitable Coloring Parameters of Certain Cycle Related Graphs

K. P. Chithra·E. A. Shiny·N. K. Sudev
View original source ↗Read source document ↗Export metadata ↓

Abstract

Coloring the vertices of a graph G subject to given conditions can be considered as a random experiment and corresponding to this experiment, a discrete random variable X can be defined as the colour of a vertex chosen at random, with respect to the given type of colouring of G and a probability mass function for this random variable can be defined accordingly. A proper coloring C of a graph G, which assigns colors to the vertices of G such that the numbers of vertices in any two colour classes differ by at most one, is called an equitable colouring of G. In this paper, we study two statistical parameters of certain cycle related graphs, with respect to their equitable colorings.

Explore related subjects

math.GM

Keep this discovery

BibTeXRIS

K. P. Chithra, E. A. Shiny, N. K. Sudev. 2018-01-01. On Equitable Coloring Parameters of Certain Cycle Related Graphs. https://arxiv.org/abs/1801.00468

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Average Chord Lengths in a Triangle

Let $P$ be a point inside a triangle $T$. We consider the average length of the chords of $T$ through $P$, where the direction of the chord is chosen uniformly. An elementary formula is obtained in terms of the distances from $P$ to the sides and vertices of the triangle. Several classical triangle centers give especially simple specializations. For example, if $I$ is the incenter, then \[ M_T(I)=\frac{2r}{\pi} \log\left(\cot\frac A4\cot\frac B4\cot\frac C4\right). \] Our main result is the sharp inequality \[ M_T(P)\le \frac{p}{\pi\sqrt3}\log(2+\sqrt3), \] valid simultaneously for every triangle of perimeter $p$ and every interior point $P$. Thus, among all such pairs $(T,P)$, the largest possible average chord length occurs only when $T$ is equilateral and $P$ is its center. The proof is an elementary symmetrization argument. We close with brief remarks relating the problem to the radial center of a convex body, the electrostatic potential center of a triangle, and dual quermassintegrals.

math.GM↗
arXiv2026

A Proof of Liu's Conjecture on the Fundamental Triangle Inequality

Let $a,b,c$ be the side lengths of a triangle, and let $R$ and $r$ denote its circumradius and inradius, respectively. We prove a conjecture of Liu stating that \[\sum_{\mathrm{cyc}} \left(\frac{a(b+c-a)}{bc}\right)^k \geq 2+\left(\frac{2r}{R}\right)^k,~~k>1, \] with the reverse inequality for $0<k<1$. The proof reduces the problem to three positive variables with fixed sum and product. We also determine the equality cases.

math.GM↗