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The 3-by-3 lemma for regular Goursat categories

Stephen Lack

We prove a $3\times 3$ lemma for regular Goursat categories.

Homology, Homotopy and Applications, Vol. 6(2004), No. 1, pp. 1-3

http://www.rmi.acnet.ge/hha/volumes/2004/n1a1/v6n1a1.dvi (ps, dvi.gz, ps.gz, pdf)
ftp://ftp.rmi.acnet.ge/pub/hha/volumes/2004/n1a1/v6n1a1.dvi (ps, dvi.gz, ps.gz, pdf)