Editing Sequence (section)

====Spectral sequences====
{{Main|Spectral sequence}}
In [[homological algebra]] and [[algebraic topology]], a '''spectral sequence''' is a means of computing homology groups by taking successive approximations. Spectral sequences are a generalization of [[exact sequence]]s, and since their introduction by {{harvs|txt|authorlink=Jean Leray|first=Jean|last=Leray|year=1946}}, they have become an important research tool, particularly in [[homotopy theory]].