{"slug": "leonhard-euler", "label": "Leonhard Euler", "wikipedia": "https://en.wikipedia.org/wiki/Leonhard_Euler", "wikidata": "https://www.wikidata.org/wiki/Q7604", "qid": "Q7604", "description": "Swiss mathematician, physicist, and engineer (1707–1783)", "entries": 8, "years": 7, "span": [1707, 1783], "span_label": ["1707 CE", "1783 CE"], "topics": [{"title": "Science & Discovery", "count": 5}, {"title": "Births", "count": 1}, {"title": "Technology & Infrastructure", "count": 1}, {"title": "Deaths", "count": 1}], "related": [], "items": [{"year": 1707, "year_label": "1707 CE", "section": "Births", "date": "April 15", "text": "April 15 – Leonhard Euler, Swiss mathematician and physicist (d. 1783)", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1346936133#April–June", "title": "1707", "revid": 1346936133, "section": "Births › April–June"}}, {"year": 1731, "year_label": "1731 CE", "section": "Science & Discovery", "date": "November 25", "text": "November 25 – Swiss mathematician Leonhard Euler announces his use of the irrational number e (approximately 2.71828) as the base for the concept of the natural logarithm, describing it in a letter to German mathematician Christian Goldbach.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1369560841#October–December", "title": "1731", "revid": 1369560841, "section": "Events › October–December"}}, {"year": 1735, "year_label": "1735 CE", "section": "Technology & Infrastructure", "date": null, "text": "Leonhard Euler solves the Basel problem, first posed by Pietro Mengoli in 1644, and the Seven Bridges of Königsberg problem.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365121192#Date_unknown", "title": "1735", "revid": 1365121192, "section": "Events › Date unknown"}}, {"year": 1736, "year_label": "1736 CE", "section": "Science & Discovery", "date": null, "text": "Leonhard Euler produces the first published proof of Fermat's \"little theorem\".", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1360559528#Date_unknown", "title": "1736", "revid": 1360559528, "section": "Events › Date unknown"}}, {"year": 1736, "year_label": "1736 CE", "section": "Science & Discovery", "date": "June 8", "text": "June 8 – Leonhard Euler writes to James Stirling describing the Euler–Maclaurin formula, providing a disconnection between integrals and sums.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1360559528#April–June", "title": "1736", "revid": 1360559528, "section": "Events › April–June"}}, {"year": 1742, "year_label": "1742 CE", "section": "Science & Discovery", "date": "June 7", "text": "June 7 – Christian Goldbach first describes Goldbach's conjecture (\"Every even number is the sum of two primes\") in a letter to fellow mathematician Leonhard Euler.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1360184270#April_–June", "title": "1742", "revid": 1360184270, "section": "Events › April –June"}}, {"year": 1748, "year_label": "1748 CE", "section": "Science & Discovery", "date": null, "text": "Leonhard Euler publishes Introductio in analysin infinitorum, an introduction to pure analytical mathematics, in Berlin.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1361284371#Date_unknown", "title": "1748", "revid": 1361284371, "section": "Events › Date unknown"}}, {"year": 1783, "year_label": "1783 CE", "section": "Deaths", "date": "September 18", "text": "September 18 – Leonhard Euler, Swiss mathematician, physicist (b. 1707)", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1370056030#Deaths", "title": "1783", "revid": 1370056030, "section": "Deaths"}}]}