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Euclidean geometry is a mathematical system attributed to the Alexandrian Greek mathematician Euclid, which he described in his textbook on geometry: the Elements. Euclid's method consists in assuming a small set of intuitively appealing axioms, and deducing many other propositions (theorems) from these.

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Are there infinitely many "generalized triangle vertices"?

I found this property of X(1138) no later than 2015. I called them X(4),X(74) and X(1138) system centers and tried to find another one but failed. I also found they all lie on the Neuberg's cubic an …
劉志宏's user avatar