E135 -- Variae demonstrationes geometriae
(Various geometric demonstrations)
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.
According to the records, it was presented to the St. Petersburg Academy on
September 2, 1748.
Originally published in Novi Commentarii academiae scientiarum Petropolitanae 1, 1750, pp. 49-66
Opera Omnia: Series 1, Volume 26, pp. 15 - 32
- A handwritten French translation of this treatise can be found in the library of the observatory in
Uccle, near Brussels.
- Original publication: E135
- Adam Glover of Georgetown College has prepared a translation of E135.
- E135 is discussed in Ed Sandifer's How Euler Did It January 2005 column published online by the MAA.
- The Euler Archive attempts to monitor current scholarship for articles and books that may be of interest to Euler Scholars. Selected references we have found that discuss or cite E135 include:
- Bilinski S., “Ptolemaic postulates.” Monatshefte fur Mathematik, 77 (3), pp. 193-205 (1973).
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