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X(1), X(35), X(36), X(1094), X(1095), X(2169), X(5353), X(5357), X(6126), X(6149), X(7343), X(35197), X(35198), X(35199), X(35200), X(35201)

X(51801) → X(51806)

vertices of the incentral triangle

Geometric properties :

K1287 is mentioned in ETC, preamble just before X(35197).

It is the barycentric product X(1) × K856. It is equivalent to the Neuberg cubic K001, see Table 20.

Recall that every pK(X50, P), with P on the Stammler diagonal rectangular hyperbola, is equivalent to the Neuberg cubic. See K073 and K390 for other examples.