The spirics (or toric curves) are the curves traced on a torus.

Examples:
    - the planar spirics,
    - the bitorics (intersection of two tori),
    - the Archytas curve (intersection torus-cylinder),
     - the toric solenoids,
    - the asymptotic lines of the torus,
    - the geodesics of the torus,
    - the rhumb lines of the torus,
    - the helices of the torus.
 

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© Robert FERRÉOL   2018