Editing Exact functor (section)

{{Short description|Functor that preserves short exact sequences}}
{{otheruses4|exact functors in homological algebra|exact functors between regular categories|regular category}}
In [[mathematics]], particularly [[homological algebra]], an '''exact functor''' is a [[functor]] that preserves [[short exact sequence]]s. Exact functors are convenient for algebraic calculations because they can be directly applied to presentations of objects. Much of the work in homological algebra is designed to cope with functors that ''fail'' to be exact, but in ways that can still be controlled.