Cs. Zhou et Ch. Lai, SYNCHRONIZATION WITH POSITIVE CONDITIONAL LYAPUNOV EXPONENTS, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 58(4), 1998, pp. 5188-5191
Synchronization of chaotic systems may occur only when the largest con
ditional Lyapunov exponent of the driven system is negative. The synch
ronization with positive conditional Lyapunov exponents reported in a
recent paper [Phys. Rev. E 56, 2272 (1997)] is a combined result of th
e contracting region of the system and the finite precision in compute
r simulations. [S1063-651X(98)05910-8].