Reciprocation

An incidence-preserving transformation in which points and lines are transformed into their poles and polars. AProjective Geometry-like Duality Principle holds for reciprocation.

References

Coxeter, H. S. M. and Greitzer, S. L. ``Reciprocation.'' §6.1 in Geometry Revisited. Washington, DC: Math. Assoc. Amer., pp. 132-136, 1967.

• Poncelet-Steiner Theorem
• Poncelet's Theorem
• Poncelet Transform
• Poncelet Transverse
• Pong Hau K'i
• Pons Asinorum
• Pontryagin Class
• Pontryagin Duality
• Pontryagin Maximum Principle
• Pontryagin Number
• Ponzo's Illusion
• Pop
• Population Comparison
• Population Growth
• Porism
• Porter's Constant
• Poset
• Poset Dimension
• Position Four-Vector
• Position Vector
• Positive
• Positive Definite Function
• Positive Definite Matrix
• Positive Definite Quadratic Form
• Positive Definite Tensor