By Johan C.-E. Stén

The Finnish mathematician and astronomer Anders Johan Lexell (1740–1784) used to be a long-time shut collaborator in addition to the tutorial successor of Leonhard Euler on the Imperial Academy of Sciences in Saint Petersburg. Lexell used to be at the start invited by means of Euler from his local city of Abo (Turku) in Finland to Saint Petersburg to help within the mathematical processing of the astronomical facts of the drawing close transit of Venus of 1769. many years later he grew to become a regular member of the Academy. this is often the first-ever full-length biography dedicated to Lexell and his prolific medical output. His wealthy correspondence particularly from his grand travel to Germany, France and England finds him as a lucid observer of the highbrow panorama of enlightened Europe. within the skies, a comet, a minor planet and a crater at the Moon named after Lexell additionally perpetuate his memory.

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**Example text**

16 The list contains both new and old, “Newtonian” and “Leibnizian” literature. Accordingly, in Wallenius’s and Lexell’s work, differentials were called fluxions as in Newton, whereas the notation was due to Leibniz. In general, the attitude in Sweden towards the new calculus, whether of Leibniz or Newton, was pragmatic. g. Newton’s Principia, the Cologne edition from 1760), but since these books were very valuable, Lexell may have acquired them later. The number of books on mathematics, physics, chemistry and astronomy in the academic library in Åbo was limited: However, the Opera of both Jakob and Johann Bernoulli, the principal works of Leibniz, ’s Gravesande and Musschenbroek had been acquired before the 1750s [165].

24. E65). On the other hand, the expression they have in common is typical of works in integral calculus of the time. 30 2 Humble Beginnings Philosophical Faculty of Uppsala University for 19 February 1763 state that Lexell, during the absence of Professor Meldercreutz,20 had quickly applied for permission to preside the dissertation of the thesis as a recommendation for “some position in Stockholm” and, consequently, a student by the name of Erik Östling was assigned to defend the thesis (pro exercitio).

Eric. Östling, Gestr. begärande ther til Facultetens tilstånd, hwilket Faculteten icke heller will wägra, enär bemälte Magister upter sitt Magister bref och genom Disputations ingifwande til censur hos Decanus wisar sin skickelighet. Och som Capitaine Meldercreutz, hwilkom, jämte Decano tilkommer pröfwa thetta hans profession tilhörande ämne, nu är borta med Illustrissimi Cancellarii tilstånd, i fall Wälbemälte Capitaine til början af Mars månad, tå permission uphörer, ej kommer i staden, på thet Magister Lexell icke må hindras i the angelägenheter han föregifwer, resolverade Faculteten, at låta Disputation til Profes.