Find the title of course whose prerequisite is course Differential Geometry.
SELECT title FROM course WHERE course_id IN (SELECT T1.course_id FROM prereq AS T1 JOIN course AS T2 ON T1.prereq_id  =  T2.course_id WHERE T2.title  =  'Differential Geometry')
Elbette önkoşul ders diferansiyel geometrisi olan başlığı bulun.