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Double Spiral    

Robert P. Munafo, 2008 Feb 16.

Colloquial term for either of two different types of filament features:

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-0.770231 + 0.115354i @ 0.005
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Two filaments of R2F(1/2(1/14B1)B*) that spiral in to a point. This is the more common usage of "double spiral". The 2-fold rotational symmetry centers around a Misiurewicz point. This particular image is from the west side of Seahorse valley.

-0.74453986035590 +0.12172377389443i  6.0e-11
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A double hook in the east side of Seahorse Valley. Rollo Silver has referred to this type of feature as "double spiral". In this case the 2-fold symmetry centers on an island; each spiral is a single spiral but they form a matched pair.

revisions: 20080216 oldest on record; 20100922 add double spirals link

From the Mandelbrot Set Glossary and Encyclopedia, by Robert Munafo, (c) 1987-2024.

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