We characterize when the coequalizer and the exact completion of a category $\cal C$ with finite sums and weak finite limits coincide.
Theory and Applications of Categories, Vol. 6, 1999, No. 6, pp 77-82 http://www.tac.mta.ca/tac/volumes/6/n6/n6.dvi http://www.tac.mta.ca/tac/volumes/6/n6/n6.ps ftp://ftp.tac.mta.ca/pub/tac/html/volumes/6/n6/n6.dvi ftp://ftp.tac.mta.ca/pub/tac/html/volumes/6/n6/n6.psTAC Home