We characterize when the coequalizer and the exact completion of a category $\cal C$ with finite sums and weak finite limits coincide.
Keywords: exact completion, coequalizer completion, variety.
1991 MSC: 18A99.
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
http://www.tac.mta.ca/tac/volumes/6/n6/n6.pdf
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.ps