After his studies of mathematics , physics , and geography in Marburg and GÃ ttingen , he worked as a private lecturer in theoretical physics at GÃ ttingen in 1925 , professor at Rostock in 1927 , Leipzig in 1929 , Jena in 1946 , Frankfurt\/Main in 1951 and from 1957 again in GÃ ttingen . After his studies of mathematics , physics , and geography in Marburg and GÃ ttingen , he worked as a private lecturer for theoretical physics in GÃ ttingen ( 1925 ) , professor in Rostock ( 1927 ) , Leipzig ( 1929 ) , Jena ( 1946 ) , Frankfurt\/Main ( 1951 ) and from 1957 again in GÃ ttingen .