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SICI SPIRAL
Sici: initials of the Sine Integral (Si) and the Cosine Integral (Ci) (name given by Von Seggern in 1993).
Other name: Nielsen spiral. |
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Cartesian parametrization: Complex parametrization: Curvilinear abscissa: Cartesian tangential angle: Radius of curvature: Intrinsic equation 1: Transcendental curve. |
The ordinate of the asymptote is equal to the value of the Dirichlet integral .
Curve very similar to the portion of hyperbolic spiral: .
Compare also to the Cornu spiral.
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© Robert FERRÉOL 2017