‎"EULER, LEONHARD.‎
‎Variae Demonstrationes Geometriae. (Various geometric demonstrations).‎

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‎(Petropoli (St. Petersbourg), 1750). 4to. Uncut, without wrappers. Extracted from ""Novi Commentarii Academiae Scientiarum Imperialis Petropolitanae"", Tom. I. ad Annum 1747 et 1748. Pp. 49-66 a. 1 engraved plate. Clean and fine.‎

Reference : 42897

‎First printing of an importent paper in geometry in which ""Euler says that a proof of a theorem by Fermat can be done from a strictly Euclidean way. He also presents relations about triangles and quadrilaterals, relating products of side lengths, squares of side lengths, and areas."" - Enestroem No. 135.‎

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