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===1666–1674===
[[File:Gottfried-Wilhelm-Leibniz-Louis-Dutens-opera-omnia MG 1180.tif|thumb|Gravuraĵo de Gottfried Wilhelm Leibniz]]
La unuunua posteno de Leibniz estis kiel salajrita sekretario de [[alkemio|alkemia]] societo en [[Nurembergo]].<ref>Ariew R., G.W. Leibniz, life and works, p.21 en ''The Cambridge Companion to Leibniz'', eld. de N. Jolley, Cambridge University Press, 1994, ISBN 0521365880, [https://books.google.com/books?id=SnRis5Gdi8gC&pg=PA21 Resumo de paĝo 21]</ref> Li konis malmulte pri tiu afero tiam sed prezentiĝis kiel rapida lerninto. Li tuj renkontiĝis kun Johann Christian von Boyneburg (1622–1672), la elpostenigita ĉefministro de la Elektisto de [[Majenco]], nome [[Johann Philipp von Schönborn]].<ref>Mackie (1845), 43</ref> Von Boyneburg dungis Leibniz kiel helpanto, kaj tuj tiele li reamikiĝis kun la Elektisto kaj prezentis Leibniz al li. Leibniz poste dediĉis eseon pri juro al la Elektisto espere akiri dungon. La ruzaĵo funkciis; la Elektisto petis al Leibniz helpi kun la redezajno de la jura kodo por sia Elektolando.<ref>Mackie (1845), 44-45</ref> En 1669, Leibniz estis nomumita Konsilisto en la Tribunalo. Kvankam von Boyneburg mortiĝis fine de 1672, Leibniz restis sub la dungado de lia vidvino ĝis ŝi maldungis lin en 1674.
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Von Boyneburg didmulton muchfaris topor promotehelpi Leibniz'sla reputation,reputacion andde theLeibniz, latter'skaj memorandala andpostaj lettersmemoraĵoj begankaj toleteroj attractkomencis favorableallogi noticefavorajn rezultojn. Al la servo de Leibniz's serviceal tola theElektisto Electortuj soonsekvis followedpostenon ade [[diplomatdiplomato]]ic role. He publishedLi anpublikigis essayeseon, underlaŭ thela pseudonympseŭdonimo ofde a fictitiousfikcia [[PolandPollando|Polishpola]] noblemannobelo, arguingplendante (unsuccessfullymalsukcese) forpor thela Germangermana candidatekandidato forpor thela Polishpola crownkrono. TheLa mainĉefa forceforto inen [[EuropeEŭropo|eŭropa]]an geopoliticsgeopolitiko duringdum Leibniz'sla adultplenkreskeco lifede wasLeibniz theestis ambitionla ofambicio de [[LouisLudoviko XIVla of14-a France(Francio)]], backedbakita byde Frenchla militaryfranca andmilita economickaj mightekonomia medio. MeanwhileDume, thela [[ThirtyTridekjara Years' WarMilito]] hadestis leftlasinta [[German language inGermana Europelingvo|Germangerman-speakingparolantan EuropeEŭropon]] exhausteddetruita, fragmentedfragmentita, andkaj economicallyekonomie backwardmalprogresinta. Leibniz proposedproponis toprotekti protectla Germangerman-speakingparolantan EuropeEŭropon byper distractingdispelo Louisde asLudoviko followsjene. FranceFrancio wouldestus beinvitata invited to takekonkeri [[EgyptEgipto]]n askiel akomenca steppingpaŝo stoneal towardseventuala ankonkero eventual conquest of thede [[Dutch EastNederlanda IndiesHindio]]. In return, France would agree to leave Germany and the Netherlands undisturbed. This plan obtained the Elector's cautious support. In 1672, the French government invited Leibniz to [[Paris]] for discussion,<ref>Mackie (1845), 58-61</ref> but the plan was soon overtaken by the outbreak of the [[Franco-Dutch War]] and became irrelevant. Napoleon's failed invasion of Egypt in 1798 can be seen as an unwitting, late implementation of Leibniz's plan, after the Eastern hemisphere colonial supremacy in Europe had already passed from the Dutch to the British.
Thus Leibniz began several years in Paris. Soon after arriving, he met [[Netherlands|Dutch]] physicist and mathematician [[Christiaan Huygens]] and realised that his own knowledge of mathematics and physics was patchy. With Huygens as his mentor, he began a program of [[self-study]] that soon pushed him to making major contributions to both subjects, including discovering his version of the differential and integral [[calculus]]. He met [[Nicolas Malebranche]] and [[Antoine Arnauld]], the leading French philosophers of the day, and studied the writings of [[Descartes]] and [[Blaise Pascal|Pascal]], unpublished as well as published. He befriended a German mathematician, [[Ehrenfried Walther von Tschirnhaus]]; they corresponded for the rest of their lives. In 1675 he was admitted by the [[French Academy of Sciences]] as a foreign honorary member, despite his lack of attention to the academy.
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