Methods of Homological Algebra
《Methods of Homological Algebra》 · 第 113 页 · Chapter II, Section 5.11
… with \(k=\ker\varphi\), \(i=\operatorname{Coker}k\), \(c=\operatorname{Coker}\varphi\), \(j=\ker c\), as well as a morphism \(l:I\to I'\) such that \(\varphi=j\circ l\circ i\). […] Sometimes \((I',j)\) is called the image of \(\varphi\), and \((I,i)\) is the coimage of \(\varphi\).