Home > ELA > Vol. 30 (2015)

#### Article Title

Recent results on the majorization theory of graph spectrum and topological index theory

#### Keywords

Spectral radius, Degree sequence, Majorization

#### Abstract

Suppose π = (d_1,d_2,...,d_n) and π′ = (d′_1,d′_2,...,d′_n) are two positive non- increasing degree sequences, write π ⊳ π′ if and only if π \neq π′, \sum_{i=1}^n d_i = \sum_{i=1}^n d′_i, and \sum_{i=1}^j d_i ≤ \sum_{i=1}^j d′_i for all j = 1, 2, . . . , n. Let ρ(G) and μ(G) be the spectral radius and signless Laplacian spectral radius of G, respectively. Also let G and G′ be the extremal graphs with the maximal (signless Laplacian) spectral radii in the class of connected graphs with π and π′ as their degree sequences, respectively. If π ⊳ π′ can deduce that ρ(G) < ρ(G′) (respectively, μ(G) < μ(G′)), then it is said that the spectral radii (respectively, signless Laplacian spectral radii) of G and G′ satisfy the majorization theorem. This paper presents a survey to the recent results on the theory and application of the majorization theorem in graph spectrum and topological index theory.

#### Recommended Citation

Liu, Muhuo; Liu, Bolian; and Das, Kinkar Ch..
(2015),
"Recent results on the majorization theory of graph spectrum and topological index theory",
*Electronic Journal of Linear Algebra*,
Volume 30.

DOI: https://doi.org/10.13001/1081-3810.3086

*Abstract*