Model cofibration
= Model cofibration
{title2=$\mathcal C$}
= Cofibration in a model category
{synonym}
A morphism in the chosen cofibration class of a <model category>. In the <projective model structure on nonnegative chain complexes> it is a degreewise split injection with degreewise projective cokernel. This usage is distinguished from the topological <cofibration>.