The intersection Fl of the Gergonne line and the Soddy line. In the above figure, D', E', and F' are the Nobbs points, I is the incenter, Ge is the Gergonne point, and S and S' are the Soddy centers. The Fletcher point has triangle center function α_1323 = sec^2(1/2 A)[2cos^2(1/2 A) - cos^2(1/2 B) - cos^2(1/2 C)] and is Kimberling center X_1323.
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