The first de Villiers point is the perspector of the reference triangle and its BCI
triangle, which is Kimberling center 
and has triangle
center function
 |
First de Villiers Point
See also
de Villiers Points, Second de Villiers PointExplore with Wolfram|Alpha
References
de Villiers, M. "A Dual to Kosnita's Theorem." Math. Info. Quart. 6, 169-171, 1996. http://mzone.mweb.co.za/residents/profmd/kosnita.htm.Referenced on Wolfram|Alpha
First de Villiers PointCite this as:
Weisstein, Eric W. "First de Villiers Point." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/FirstdeVilliersPoint.html