scholarly journals Towards Gallai's path decomposition conjecture

2020 ◽  
Author(s):  
Fábio Botler ◽  
Maycon Sambinelli
Keyword(s):  
1974 ◽  
Vol 10 (3) ◽  
pp. 421-427 ◽  
Author(s):  
Brian R. Alspach ◽  
Norman J. Pullman

A path decomposition of a digraph G (having no loops or multiple arcs) is a family of simple paths such that every arc of G lies on precisely one of the paths of the family. The path number, pn(G) is the minimal number of paths necessary to form a path decomposition of G.We show that pn(G) ≥ max{0, od(v)-id(v)} the sum taken over all vertices v of G, with equality holding if G is acyclic. If G is a subgraph of a tournament on n vertices we show that pn(G) ≤ with equality holding if G is transitive.We conjecture that pn(G) ≤ for any digraph G on n vertices if n is sufficiently large, perhaps for all n ≥ 4.


2021 ◽  
Vol 322 ◽  
pp. 129006
Author(s):  
Junhua Zhang ◽  
Heming Wang ◽  
Lin Ma ◽  
Jian Wang ◽  
Jiashi Wang ◽  
...  

1980 ◽  
Vol 12 (02) ◽  
pp. 291-293 ◽  
Author(s):  
Priscilla Greenwood ◽  
Jim Pitman

1978 ◽  
Vol 6 (2) ◽  
pp. 345-348 ◽  
Author(s):  
P. W. Millar

Sign in / Sign up

Export Citation Format

Share Document