We mentioned Smale above, and the second was Daniel Quillen who wrote his thesis Formal Properties of Over-Determined Systems Of Linear Partial Differential Equations at Harvard. Quillen was awarded his doctorate in 1964 and a Fields Medal in 1978.
Smale namin na nabanggit sa itaas, at ang pangalawa ay Daniel Quillen wrote kanyang sanaysay na pormal na Katangian ng Over-tinutukoy Systems Of Linear Bahagyang kaugalian equation sa Harvard. Quillen ay iginawad sa kanyang titulo ng doktor sa 1,964 at isang patlang na medalya sa 1978.