Editing Homological algebra (section)

==History==
Homological algebra began to be studied in its most basic form in the late 19th century as a branch of topology and in the 1940s became an independent subject with the study of objects such as the [[ext functor]] and the [[tor functor]], among others.<ref name="Weber">{{cite book|doi=10.1016/b978-044482375-5/50029-8|chapter=History of homological algebra|title=History of Topology|pages=797–836|year=1999|last1=Weibel|first1=Charles A.|isbn=9780444823755}}</ref>