Complex sentence: Lindenstrauss works in the area of dynamics, particularly in the area of ergodic theory and its applications in number theory, with Anatole Katok and Manfred Einsiedler he made progress on the Littlewood conjecture.
Split into simpler sentences: Lindenstrauss works in the area of dynamics, particularly in the area of ergodic theory and its applications in number theory. With Anatole Katok and Manfred Einsiedler, he made progress on the Littlewood conjecture.