A computational method for hierachical optimization of complex systems

2005 ◽  
pp. 26-40
Author(s):  
A. Kalliauer
Keyword(s):  
Complex Systems ◽  
Computational Method

scholarly journals The complexity of the four colour theorem

2010 ◽  
Vol 13 ◽  
pp. 414-425 ◽  
Author(s):  
Cristian S. Calude ◽  
Elena Calude
Keyword(s):  
Complex Systems ◽  
Planar Graph ◽  
Riemann Hypothesis ◽  
Logic Program ◽  
Formal Proof ◽  
Complexity Class ◽  
Computational Method ◽  
Equational Logic ◽  
Four Color Theorem ◽  
Mathematical Problems

AbstractThe four colour theorem states that the vertices of every planar graph can be coloured with at most four colours so that no two adjacent vertices receive the same colour. This theorem is famous for many reasons, including the fact that its original 1977 proof includes a non-trivial computer verification. Recently, a formal proof of the theorem was obtained with the equational logic program Coq [G. Gonthier, ‘Formal proof–the four color theorem’,Notices of Amer. Math. Soc.55 (2008) no. 11, 1382–1393]. In this paper we describe an implementation of the computational method introduced by C. S. Calude and co-workers [Evaluating the complexity of mathematical problems. Part 1’,Complex Systems18 (2009) 267–285; A new measure of the difficulty of problems’,J. Mult. Valued Logic Soft Comput.12 (2006) 285–307] to evaluate the complexity of the four colour theorem. Our method uses a Diophantine equational representation of the theorem. We show that the four colour theorem is in the complexity class ℭU,4. For comparison, the Riemann hypothesis is in class ℭU,3while Fermat’s last theorem is in class ℭU,1.

Complex systems-operational approaches

1990 ◽  
Vol 160 (7) ◽  
pp. 163-164
Author(s):  
Boris B. Kadomtsev
Keyword(s):  
Complex Systems
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