The points I, N',I' are collinear.
Let A"B"C" be the pedal triangle of I' wrt A'B'C'.
I' is the NPC center A"B"C".(Randy Hutson)
The line II' is the Euler line of A"B"C"
Antreas P. Hatzipolakis, 15 May 2013
Anopolis #255 (Re: NPC center of the cevian triangle of I)