Rotation number
In mathematics, the rotation number is an invariant of homeomorphisms of the circle. == History == It was first defined by Henri Poincaré in 1885, in relation to the precession of the perihelion of a planetary orbit.
In mathematics, the rotation number is an invariant of homeomorphisms of the circle. == History == It was first defined by Henri Poincaré in 1885, in relation to the precession of the perihelion of a planetary orbit.
In mathematics, the rotation number is an invariant of homeomorphisms of the circle. == History == It was first defined by Henri Poincaré in 1885, in relation to the precession of the perihelion of a planetary orbit.
Source: Wikipedia "Rotation number" · CC BY-SA 4.0
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