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Algorithms to disprove the Poincare Conjecture。
Local tree-width, excluded minors, and approximation algorithms
Local tree-width excluded minors approximation algorithms
2010/11/1
The local tree-width of a graph G=(V,E) is the function ltw^G: N -> N that associates with every natural number r the maximal tree-width of an r-neighborhood in G. Our main graph theoretic result is ...