Dec 29, 2019
In a short exact sequence of vector fields 0 → A → B → C→ 0,B must be the direct sum B=A⊕C of the subgroup A and the quotient group C=B/A.
Allen Hatcher

seen from Malaysia
seen from United States
seen from United States

seen from United States
seen from United States

seen from Malaysia

seen from Malaysia
seen from Malaysia

seen from United States
seen from France

seen from Malaysia

seen from Malaysia
seen from China
seen from Netherlands
seen from United States

seen from Malaysia

seen from Malaysia
seen from Russia
seen from United States

seen from Malaysia
In a short exact sequence of vector fields 0 → A → B → C→ 0,B must be the direct sum B=A⊕C of the subgroup A and the quotient group C=B/A.
Allen Hatcher