Neave effect also occurs with Tausworthe sequences
Shu Tezuka
WSC 1991
Recently, Becker and Geiger and Bafna, Berman and Fujito gave 2-approximation algorithms for the feedback vertex set problem in undirected graphs. We show how their algorithms can be explained in terms of the primal-dual method for approximation algorithms, which has been used to derive approximation algorithms for network design problems. In the process, we give a new integer programming formulation for the feedback vertex set problem whose integrality gap is at worst a factor of two; the well-known cycle formulation has an integrality gap of Θ(log n), as shown by Even, Naor, Schieber and Zosin. We also give a new 2-approximation algorithm for the problem which is a simplification of the Bafna et al. algorithm. © 1998 Elsevier Science B.V. All rights reserved.
Shu Tezuka
WSC 1991
W.C. Tang, H. Rosen, et al.
SPIE Optics, Electro-Optics, and Laser Applications in Science and Engineering 1991
Hannaneh Hajishirzi, Julia Hockenmaier, et al.
UAI 2011
Satoshi Hada
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences