A triangle center is said to be polynomial iff there is a triangle
center function 
that is a polynomial in 
,
,
and 
(Kimberling 1998, p. 46).
Polynomial Triangle Center
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References
Kimberling, C. "Triangle Centers and Central Triangles." Congr. Numer. 129, 1-295, 1998.Referenced on Wolfram|Alpha
Polynomial Triangle CenterCite this as:
Weisstein, Eric W. "Polynomial Triangle Center." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/PolynomialTriangleCenter.html