“The equal internal bisectors theorem, 1840-1940. … Many solutions or none?” A centenary account

DOI10.1017/S0950184300000021zbMath0060.33312MaRDI QIDQ5836716

J. A. M'Bride

Publication date: 1943

Published in: Edinburgh Mathematical Notes (Search for Journal in Brave)

zbMATH Keywords

elementary geometry

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The Steiner-Lehmus theorem and ``triangles with congruent medians are isosceles hold in weak geometries ⋮ Direct and indirect methods of proof. The Lehmus-Steiner theorem ⋮ The three Steiner-Lehmus theorems

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