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- Walter Carballosa, Domingo Pestana, José M. Rodríguez, Jose Maria Sigarreta
- Electr. J. Comb.
- 2012

If X is a geodesic metric space and x 1 , x 2 , x 3 ∈ X, a geodesic triangle T = {x 1 , x 2 , x 3 } is the union of the three geodesics [x 1 x 2 ], [x 2 x 3 ] and [x 3 x 1 ] in X. The space X is δ-hyperbolic (in the Gromov sense) if any side of T is contained in a δ-neighborhood of the union of the other two sides, for every geodesic triangle T in X. We… (More)

- Walter Carballosa, José M. Rodríguez, Jose Maria Sigarreta, María Villeta
- Electr. J. Comb.
- 2011

If X is a geodesic metric space and x 1 , x 2 , x 3 ∈ X, a geodesic triangle T = {x 1 , x 2 , x 3 } is the union of the three geodesics [x 1 x 2 ], [x 2 x 3 ] and [x 3 x 1 ] in X. The space X is δ-hyperbolic (in the Gromov sense) if any side of T is contained in a δ-neighborhood of the union of the two other sides, for every geodesic triangle T in X. We… (More)

- Walter Carballosa, Rocío M. Casablanca, Amauris de la Cruz, José M. Rodríguez
- Electr. J. Comb.
- 2013

If X is a geodesic metric space and x 1 , x 2 , x 3 ∈ X, a geodesic triangle T = {x 1 , x 2 , x 3 } is the union of the three geodesics [x 1 x 2 ], [x 2 x 3 ] and [x 3 x 1 ] in X. The space X is δ-hyperbolic (in the Gromov sense) if any side of T is contained in a δ-neighborhood of the union of the two other sides, for every geodesic triangle T in X. If X… (More)

- Walter Carballosa, José M. Rodríguez, Jose Maria Sigarreta
- Ars Comb.
- 2016

- Walter Carballosa, Ana Portilla, José M. Rodríguez, Jose Maria Sigarreta
- Graphs and Combinatorics
- 2015

- Walter Carballosa, José M. Rodríguez, Jose Maria Sigarreta, Yadira Torres-Nuñez
- Electronic Notes in Discrete Mathematics
- 2014

- Walter Carballosa, Domingo Pestana, José M. Rodríguez, Jose Maria Sigarreta
- Electronic Notes in Discrete Mathematics
- 2014

- Walter Carballosa, Amauris de la Cruz, José M. Rodríguez
- Electronic Notes in Discrete Mathematics
- 2014

the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract A nonempty set S ⊂ V is a defensive k-alliance in G = (V, E), k ∈ [−Δ, Δ] ∪ Z, if for every v ∈ S, d S (v) ≥ d ¯ S (v) + k. A defensive k-alliance S is called exact, if S is defensive… (More)

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