We show that it is NP-hard to determine if a cubic graph G is l-tough. We then use this result to show that for any integer t > 1, it is NP-hard to determine if a 3 t-regular graph is t-tough. We conclude with some remarks concerning the complexity of recognizing certain subclasses of tough graphs.
On the complexity of the approximation of nonplanarity parameters for cubic graphs
✍ Scribed by Luerbio Faria; Celina M. Herrera de Figueiredo; Candido F.X. Mendonça
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 496 KB
- Volume
- 141
- Category
- Article
- ISSN
- 0166-218X
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✦ Synopsis
Let G = (V; E) be a simple graph. The NON-PLANAR DELETION problem consists in ÿnding a smallest subset E ⊂ E such that H =(V; E\E ) is a planar graph. The SPLITTING NUMBER problem consists in ÿnding the smallest integer k ¿ 0, such that a planar graph H can be deÿned from G by k vertex splitting operations. We establish the Max SNP-hardness of SPLITTING NUMBER and NON-PLANAR DELETION problems for cubic graphs.
📜 SIMILAR VOLUMES
It is a simple fact that cubic Hamiltonian graphs have at least two Hamiltonian cycles. Finding such a cycle is NP-hard in general, and no polynomial-time algorithm is known for the problem of finding a second Hamiltonian cycle when one such cycle is given as part of the input. We investigate the co