HYACINTHOS 23074

[Antreas P. Hatzipolakis]:
 

Let ABC be a triangle.

Denote:

Na = the NPC center of IBC

Aa Ab, Ac = the reflections of Na in AI,BI,CI

(N1) = the NPC of AaAbAc

Similary (N2), (N3).

(N1), (N2), (N3) concur (on OI line).

Point?

APH

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[CL]

Point=X(942)

 

César Lozada