When mathematicians refer to Ramanujan, they are talking about geniuses who self-educate and make lots of contributions.
(VNese) Nghe kể GS Lê Văn Thiêm hồi xưa trong bom đạn tự làm Toán và mang kết quả đi làm luận án tiến sĩ, cũng là “autodidact” như ông Ramanujan này.
Srinivasa Iyengar Ramanujan FRS (pronunciation: i/ˈʃriːniˌvɑːsə ˈrɑːmɑːˌnʊdʒən/; 22 December 1887 – 26 April 1920) was an Indian mathematician and autodidact who lived during the British Raj. Though he had almost no formal training in pure mathematics, he made substantial contributions to mathematical analysis, number theory, infinite series, and continued fractions. Ramanujan initially developed his own mathematical research in isolation; it was quickly recognized by Indian mathematicians. When his skills became obvious and known to the wider mathematical community, centred in Europe at the time, he began a partnership with the English mathematician G. H. Hardy. The Cambridge professor realized that Ramanujan had produced new theorems in addition to rediscovering previously known ones.
During his short life, Ramanujan independently compiled nearly 3,900 results (mostly identities and equations). Nearly all his claims have now been proven correct. His original and highly unconventional results, such as the Ramanujan prime and the Ramanujan theta function, have inspired a vast amount of further research. The Ramanujan Journal, a peer-reviewed scientific journal, was established to publish work in all areas of mathematics influenced by Ramanujan.
Source: Srinivasa Ramanujan – Wikipedia
Biography of Ramanujan: http://www-groups.dcs.st-and.ac.uk/history/Biographies/Ramanujan.html