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- Nair Abreu, Domingos M. Cardoso, Paula Carvalho, Cybele T. M. Vinagre
- Discrete Mathematics
- 2017

Ordering of subclasses of trees by algebraic connectivity is a very active area of research. Let G = (V,E) be a simple undirected graph on n vertices. The Laplacian matrix of G is the n × n matrix L (G) = D (G) − A (G) where A (G) is the adjacency matrix and D (G) is the diagonal matrix of vertex degrees. It is well known that L (G) is a positive… (More)

- Bruno Amaro, Leonardo Silva de Lima, Carla Silva Oliveira, Carlile Lavor, Nair Abreu
- Electronic Notes in Discrete Mathematics
- 2016

- Oscar Rojo, Luis Medina, Nair Abreu, Claudia Justel
- Electronic Notes in Discrete Mathematics
- 2009

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