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A fractal is every set with a non-integer dimension.



If you want to measure the coastal length of an island you need to agree on how to measure that. Do you take the tide line at high or low tide? And how do you do it at the mouth of a river?
There may arise large differences, particularly if you go in the details. Because you might want to measure accurately around each grain of sand exactly?



French mathematician Gaston Maurice Julia (1893 - 1978) worked on fractals.

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