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X(3), X(23), X(110), X(187), X(6141), X(6142)

vertices of the Thomson triangle

singular focus : inverse of X(5655), SEARCH = 3.08446113142242

infinite point of the lines 3,1495 - 20,1216 - 23,74 - 52,3146 - etc, SEARCH = 1.10808176487293

K903 is a member of the pencil of strophoids generated by K038 and K039. These two latter cubics are the inverses (in the circumcircle of ABC) of the Stammler and Jerabek hyperbolas respectively.

K903 is the inverse of (JT), the Thomson-Jerabek hyperbola. See K002.