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The SteinerLehmus Theorem is famous; it even has its own name and some history. It is described in the book H.S.M. Coxeter, S.L. Greitzer  Geometry Revisited, 1967. Jakob Steiner could be the greatest mathematician in synthetic geometry and was the first person to solve the problem.
Hugh Ching, who has never missed a geometry problem and has never had to take final examinations in three geometry classes of three different teachers, solved the SteinerLehmus problem in high school without knowing its popularity. After becoming the founder of PostScience, he is no longer understandable.
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