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About a conjecture on quadratic vector fields

✍ Scribed by Jean Moulin Ollagnier


Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
85 KB
Volume
165
Category
Article
ISSN
0022-4049

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✦ Synopsis


The Lotka-Volterra system of autonomous di erential equations consists in three homogeneous polynomial equations of degree 2 in three variables. This system, or the corresponding vector ΓΏeld LV (A; B; C), depends on three non-zero (complex) parameters and may be written as LV (A; B; C) = Vx@x + Vy@y + Vz@z where Vx = x(Cy + z); Vy = y(Az + x); Vz = z(Bx + y):


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On a conjecture about the hypoenergetic
✍ Jianping Liu; Bolian Liu πŸ“‚ Article πŸ“… 2010 πŸ› Elsevier Science 🌐 English βš– 308 KB

The energy E(G) of a graph G is the sum of the absolute values of the eigenvalues of G. An n-vertex graph G is said to be hypoenergetic if E(G) < n. In Gutman et al. (2008) [14] the authors conjectured that there exist n-vertex hypoenergetic trees with maximum degree βˆ† = 4 for any n ≑ 2 mod 4, n > 2