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...n symbol for inclusion first appears in [[Joseph Diaz Gergonne|Gergonne]] (1816), who defines it as one idea 'containing' or being 'contained' by another, [[Category:1816 introductions]] ...

...eodesic Operations|url=https://books.google.com/books?id=j3sAAAAAMAAJ|year=1816 |publisher=Baldwin, Cradock, and Joy}}</ref> predicting eclipses, and descr [[Category:3rd-century BC introductions]] ...

In 1816, and again in 1850, the [[French Academy of Sciences]] offered a prize for [[Category:1630s introductions]] ...