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François Ledrappier


B.S., Ecole Polytechnique, Paris, 1967
Ph.D., University of Paris VI, 1975

Office: 132 Hayes-Healy Hall
Phone: (574) 631-8331
Fax: (574) 631-6579

Research Interests

I am mostly intested in asymptotic properties of group actions and in the relations between objects associated to them. The precise setting might be diverse: Dynamical Systems Theory, Geometry of compact negatively curved manifolds, abelian covers of these, linear actions of linear groups, Random Walks on linear groups, zero entropy algebraic actions of free abelian groups, Geometric Measure Theory.

Selected Publications

  • Ledrappier, F.; Pollicott, M. Ergodic properties of linear action of (2X2) matrices. Duke Math. J.116 (2003) 353-388.
  • Ledrappier, François; Lindenstrauss, Elon On the projections of measures invariant under the geodesic flow. Int. Math. Res. Not. 2003, no. 9, 511—526.
  • Babillot, Martine; Ledrappier, François Geodesic paths and horocycle flow on abelian covers. Lie groups and ergodic theory (Mumbai, 1996), 1—32, Tata Inst. Fund. Res. Stud. Math., 14, Tata Inst. Fund. Res., Bombay, 1998.
  • Ledrappier, F.; Young, L.-S. The metric entropy of diffeomorphisms. Ann. of Math. (2) 122 (1985), no. 3, 509—574.
  • Ledrappier, François Un champ markovien peut être d’entropie nulle et mélangeant. C. R. Acad. Sci. Paris Sér. A-B 287 (1978), no. 7, A561—A563.

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