Definition
A fractal is an object or feature characterized by its fractal dimension that differs from the integer Euclidian dimension of the space in which the fractal is imbedded. On the one hand, fractals are often closely associated with the random variables studied in mathematical statistics; on the other hand, they are connected with the concept of “chaos” that is an outcome of some types of nonlinear processes. Fractals are phenomena measured in terms of their presence or absence in boxes belonging to arrays superimposed on the domain of study in 1-D, 2-D, or 3-D space. Several phenomena that originally were thought to be fractals turned out to multifractals, which are “measures” representing of how much of a feature is present within the boxes used for measurement. Multifractals are spatially intertwined fractals.
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Cheng, Q., Agterberg, F. (2021). Fractal Geometry in Geosciences. In: Daya Sagar, B.S., Cheng, Q., McKinley, J., Agterberg, F. (eds) Encyclopedia of Mathematical Geosciences. Encyclopedia of Earth Sciences Series. Springer, Cham. https://doi.org/10.1007/978-3-030-26050-7_9-1
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