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math.CO2026
On properties of the conformal circulant matrices
Cristina Manzaneda, Enide Andrade
In this paper, we introduce and study conformal permutation matrices. In particular, for a permutation , we define the corresponding conformal permutation matrix $H_{π_…
math.CO2025
Doubly Stochastic Matrices and Modified Laplacian Matrices of Graphs
Enide Andrade, Geir Dahl
We consider modified Laplacian matrices of graphs, obtained by adding the identity matrix to the Laplacian matrix of a graph . This results in a positive definite matrix $…
math.CO2023
Combinatorial Fiedler Theory and Graph Partition
Enide Andrade, Geir Dahl
Partition problems in graphs are extremely important in applications, as shown in the Data science and Machine learning literature. One approach is spectral partitioning based on a…