Measuring Chaos: Is There a Parameter for Chaotic-ness?

[paultsui]

Is there any parameter that represents the chaotic-ness of a system?

For example, can we show that a 4-body system is in general more chaotic than a 3-body problem?

Thank you : )

 

[f95toli]

I believe there are a few possible measures,
The Lyapunov exponent would be one example.

 

[Claude Bile]

Lyaponuv exponent is the basic one; it indicates the rate of divergence of two closely spaced sets of initial conditions.

Claude.