For an object, a projective cover is a morphism out of a projective object which is a superfluous epimorphism?.
U. Shukla, On the projective cover of a module and related results, Pacific J. Math. Volume 12, Number 2 (1962), 709-717 (Euclid)
Wikipedia, Projective cover
Revised on September 25, 2012 01:13:20
by Urs Schreiber