Michel Hénon

French mathematician and astronomer

Michel Hénon
Born	Michel Hénon (1931-07-23)23 July 1931 Paris
Died	7 April 2013(2013-04-07) (aged 81) Nice
Known for	Hénon map Hénon–Heiles system Broucke–Henon–Hadjidemetriou periodic orbits
Awards	Brouwer Award (1983) Prix Jean Ricard (1978)
Scientific career
Institutions	CNRS University of Arizona

Michel Hénon (French: [enɔ̃]; 23 July 1931, Paris – 7 April 2013, Nice) was a French mathematician and astronomer.^[1] He worked for a long time at the Nice Observatory.

In astronomy, Hénon is well known for his contributions to stellar dynamics. In the late 1960s and early 1970s he made important contributions on the dynamical evolution of star clusters, in particular globular clusters. He developed a numerical technique using Monte Carlo methods to follow the dynamical evolution of a spherical star cluster much faster than the so-called n-body methods.

In mathematics, he is well known for the Hénon map, a simple discrete dynamical system that exhibits chaotic behavior.

He published a two-volume work on the restricted three-body problem.

In 1978 he was awarded the Prix Jean Ricard.

References

^ "[Observatoire de la Côte d'Azur] Décès de Michel Hénon, Astronome à l'Observatoire de la Côte d'Azur". Oca.eu. 18 March 2011. Archived from the original on 6 April 2015. Retrieved 12 June 2013.

External links

Hénon's publications (a partial list from NASA Astrophysics Data System).
A discussion of Hénon's equation, contains further links.
Simulation of Hénon map in javascript (experiences.math.cnrs.fr).

Chaos theory

Concepts

Core	Attractor Bifurcation Fractal Limit set Lyapunov exponent Orbit Periodic point Phase space
Anosov diffeomorphism Arnold tongue axiom A dynamical system Bifurcation diagram Box-counting dimension Correlation dimension Conservative system Ergodicity False nearest neighbors Hausdorff dimension Invariant measure Lyapunov stability Measure-preserving dynamical system Mixing Poincaré section Recurrence plot SRB measure Stable manifold Topological conjugacy
Theorems	Ergodic theorem Liouville's theorem Krylov–Bogolyubov theorem Poincaré–Bendixson theorem Poincaré recurrence theorem Stable manifold theorem Takens's theorem

Theoretical
branches

Chaotic
maps (list)

Discrete	Arnold's cat map Baker's map Complex quadratic map Coupled map lattice Duffing map Dyadic transformation Dynamical billiards outer Exponential map Gauss map Gingerbreadman map Hénon map Horseshoe map Ikeda map Interval exchange map Irrational rotation Kaplan–Yorke map Langton's ant Logistic map Standard map Tent map Tinkerbell map Zaslavskii map
Continuous	Double scroll attractor Duffing equation Lorenz system Lotka–Volterra equations Mackey–Glass equations Rabinovich–Fabrikant equations Rössler attractor Three-body problem Van der Pol oscillator