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...Journal of geometry vol c birkh user verlag basel napoleon revisited dedicated to h s m coxeter on the occasion his th birthday j f rigby theorem can be neatly proved using a tessellation plane generalized by three similar triangles instead equilateral erected in different ways sides triangle various interesting special cases occur i there is well known attributed bonaparte although authors doubt possibility knowing enough prove result stated as follows if are externally or internally any their centres form an figure ia...