Parallel Curve
The two branches of the parallel curve a distance 
away from a parametrically represented curve 
are
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The above figure shows the curves parallel to the Ellipse.
References
Gray, A. ``Parallel Curves.'' §5.7 in Modern Differential Geometry of Curves and Surfaces. Boca Raton, FL: CRC Press, pp. 95-97, 1993. Lawrence, J. D. A Catalog of Special Plane Curves. New York: Dover, pp. 42-43, 1972. Lee, X. ``Parallel.''http://www.best.com/~xah/SpecialPlaneCurves_dir/Parallel_dir/parallel.html. Yates, R. C. ``Parallel Curves.'' A Handbook on Curves and Their Properties. Ann Arbor, MI: J. W. Edwards, pp. 155-159, 1952.
- Tensor Density
- Tensor Dual
- Tensor Product
- Tensor Space
- Tensor Spherical Harmonic
- Tensor Transpose
- Tent Map
- Terminal
- Ternary
- Tessellation
- Tesseract
- Tesseral Harmonic
- Tethered Bull Problem
- Tetrabolo
- Tetrachoric Function
- Tetracontagon
- Tetracuspid
- Tetrad
- Tetradecagon
- Tetradecahedron
- Tetradic
- Tetradyakis Hexahedron
- Tetraflexagon
- Tetragon
- Tetrahedral Coordinates