Pure mathematics became Clebsch's main research topic when he began to study the calculus of variations and partial differential equations . Clebsch moved to Giessen in 1863 and there he collaborated with Paul Gordan .
Purong matematika ay naging Clebsch main research topic kapag siya ay nagsimulang mag-aral ng calculus ng mga pagkakaiba-iba at bahagyang kaugalian equation. Clebsch inilipat sa Giessen sa 1863 at doon siya collaborated sa Paul Gordan.