de Longchamps Point
The reflection of the Orthocenter about the Circumcenter. This point is also the Orthocenter of theAnticomplementary Triangle. It has Triangle Center Function
It lies on the Euler Line.
References
Altshiller-Court, N. ``On the de Longchamps Circle of the Triangle.'' Amer. Math. Monthly 33, 368-375, 1926. Kimberling, C. ``Central Points and Central Lines in the Plane of a Triangle.'' Math. Mag. 67, 163-187, 1994. Vandeghen, A. ``Soddy's Circles and the de Longchamps Point of a Triangle.'' Amer. Math. Monthly 71, 176-179, 1964.
- 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
- Positive Integer
- Positive Semidefinite Matrix
- Positive Semidefinite Quadratic Form
- Postage Stamp Problem
- Posterior Distribution
- Postnikov System
- Postulate
- Potato Paradox
- Potential Function
- Potential Theory
- Pothenot Problem