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Self-Similarity


Self-similarity is the property of an object that looks "roughly" the same on any scale. Fractals are a particularly interesting class of self-similar objects. Self-similar objects with parameters N and s are described by a power law such as

 N=s^d,
(1)

where

 d=(lnN)/(lns)
(2)

is the "dimension" of the scaling law, known as the Hausdorff dimension.

For a self-similar attractor K on the real line defined by contracting similarities x|->r_ix+b_i, Kittle and Kogler (2026) reported that, in the absence of exact overlaps,

 dim_HK=min(1,s),
(3)

where sum_(i)|r_i|^s=1. Their generalized exact overlaps conjecture gives the dimension of self-similar probability measures in terms of composition entropy and contraction rates.


See also

Exact Overlaps Conjecture, Fractal, Hausdorff Dimension, Koch Curve, Self-Similar Measure

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References

Harris, J. W. and Stocker, H. "Scaling Invariance and Self-Similarity" and "Construction of Self-Similar Objects." §4.11.1-4.11.2 in Handbook of Mathematics and Computational Science. New York: Springer-Verlag, p. 113, 1998.Hutchinson, J. "Fractals and Self-Similarity." Indiana Univ. J. Math. 30, 713-747, 1981.Kittle, S. and Kogler, C. "The Exact Overlaps Conjecture for Self-Similar Measures on the Real Line." 7 Oct 2026. https://arxiv.org/abs/2610.10511.

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Self-Similarity

Cite this as:

Weisstein, Eric W. "Self-Similarity." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Self-Similarity.html

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