Robert P. Munafo, 1999 Feb 2.
At a branch point, the several filaments that meet are distinguished
by their rotation number.
The rotation number is an integer N from 1 to the number of branches.
Sometimes it is expressed as a fraction N/D, where D is the number of branches. Rotation numbers are used in some of the R2 system
operators; see R2 rules.
Rotation number is also a synonym for internal angle, so used by Prof. Devaney and others. See the Internal Angle entry for a complete description.
From the Mandelbrot Set Glossary and Encyclopedia, by Robert Munafo. Mu-ency index
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