[MATEMATICA] - Lotto di due importanti prime edizioni per la storia della matematica di Ruffini e Legendre: - RUFFINI, Paolo (1864-1929) Sopra la determinazione delle radici nelle equazioni numeriche di qualunque grado..Riflessioni di Pietro Abbati intorno al metodo di Lagrange. Modena: Società tipografica, 1804. First edition of this treatise by the mathematician Ruffini, known for the Ruffini's rule which is a quick method for polynomial division and the Abel–Ruffini theorem which states that quintic and higher-order equations cannot be solved by radicals. 2 parts in one volume, folio (315 x 235mm). With errata (some light browning and spotting). Original wrappers (some small tears and light wear). LEGENDRE, Adrien-Marie (1752-1833) - Nouvelles Méthodes pour la Déterminationes der Orbites des Cometes. Supplément aux Nouvelles Méthodes. Parigi: Courcier, 1806. First edition of the Supplement of the Nouvelle Methode which contains for the first time the publication of the method of least squares. 'The work by which [Legendre] is chiefly known in the history of statistics, Nouvelles methodes pour la determination des orbites des cometes. For stark clarity of exposition the presentation is unsurpassed; it must be counted as one of the clearest and most elegant introductions of a new statistical method in the history of statistics. 2 parts in one volume, 4to (265 x 205mm). Half-title, engraved plate (occasional light spotting and browning). Original pink wrappers, uncut (some tears and wear heavier on spine). DSB. Stigler, The History of Statistics, pp.11-13 .

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