Kaplan-Yorke Conjecture
There are several versions of the Kaplan-Yorke conjecture, with many of the higher dimensional ones remaining unsettled. Theoriginal Kaplan-Yorke conjecture (Kaplan and Yorke 1979) proposed that, for a two-dimensional mapping, the CapacityDimension 
equals the Kaplan-Yorke Dimension 
,
where
and 
are the Lyapunov Characteristic Exponents. This wassubsequently proven to be true in 1982. A later conjecture held that the Kaplan-Yorke Dimension is generically equal toa probabilistic dimension which appears to be identical to the Information Dimension (Frederickson et al. 1983). Thisconjecture is partially verified by Ledrappier (1981). For invertible 2-D maps, 
, where 
is theCorrelation Exponent, 
is the Information Dimension, and is the Capacity Dimension (Young1984).See also Capacity Dimension, Kaplan-Yorke Dimension, Lyapunov Characteristic Exponent, LyapunovDimension
References
Chen, Z. M. ``A Note on Kaplan-Yorke-Type Estimates on the Fractal Dimension of Chaotic Attractors.'' Chaos, Solitons, and Fractals 3, 575-582, 1994. Frederickson, P.; Kaplan, J. L.; Yorke, E. D.; and Yorke, J. A. ``The Liapunov Dimension of Strange Attractors.'' J. Diff. Eq. 49, 185-207, 1983. Kaplan, J. L. and Yorke, J. A. In Functional Differential Equations and Approximations of Fixed Points (Ed. H.-O. Peitgen and H.-O. Walther). Berlin: Springer-Verlag, p. 204, 1979. Ledrappier, F. ``Some Relations Between Dimension and Lyapunov Exponents.'' Commun. Math. Phys. 81, 229-238, 1981. Worzbusekros, A. ``Remark on a Conjecture of Kaplan and Yorke.'' Proc. Amer. Math. Soc. 85, 381-382, 1982. Young, L. S. ``Dimension, Entropy, and Lyapunov Exponents in Differentiable Dynamical Systems.'' Phys. A 124, 639-645, 1984
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