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LEIBNIZ's LIFE and WORKS.

Hannover Years under Ernst August (1680-1687)

YEAR EVENTS, PUBLISHINGS, WRITINGS note
1679
Dec
Johann Friedrich died and Ernst August became new Duke of Hannover.
1680 was annoyed by the Harz Project (introducing drain pumps and windmills into the mine of Harz, and applying its benefit to the academy of science).

experiments on windmills were made several times, but the Project costed him too much, and in 1685 whole the Project was killed.
1681
about
Mar
conversations with Otto Mencke (a professor of Leipzig University) who is going to start Acta Eruditorum (a philosophical journal that supplies informations and reviews on foreign new books for German philosophers, published in Leipzig from 1682).

Leibniz wrote about 50 articles for this Journal (1682-1713).
1682
Feb
De vera propotione circuli ad quadratum circumscriptum in numeris rationalibus

the first article published in Acta Eruditorum.
1683
Aug
Mars Christianissimus.

the first political pamphlet against Louis 14's aggressive politics, written under a pseudonym (Germanus Gallo-Graecus), in Latin and French, published in Amsterdam, 1684, translated into German, 1685.
1684
Jan
invented determinants to handle equations of higher degrees conveniently.
1684
Oct
Nova methodus pro maximis et minimis.

the first publishing (in Acta Eruditorum) about his differential calculus.
1685 interests in genealogy and historiography.

in connection with researches into the origin and the ancestors of the Duke's family-tree. The interest will send Leibniz to Italy looking for old manuscripts.
1686
Feb
Discours de métaphysique.

through Landgrave Ernst von Hessen-Rheinfels, sent a summary to Antoine Arnauld (a famous Jansenist, philosopher of Port-Royal, who also wrote a book of geometry). Leibniz firstly sent a letter to Arnauld in 1671 (no reply), and has known him since 1672.
The text of Discours de métaphysique is not published until 1846.
Bertrand Russell will be impressed by the work in 1899.
1846
1686
Feb
correspondence with Arnauld.

published with Discours de métaphysique in 1846. It has become an invaluable source showing the core philosophy of Leibniz.

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