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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
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+This is a set of macros that are a front end to xy-pic that make it
+(relatively) easy to use it to set the kind of diagrams that are
+especially interesting to category theorists. There are two modes of
+macros: the first kind uses shapes such as squares and various triangles
+that fit together like Lego blocks; the second sets the nodes on an
+xy-grid and labels them and then sets arrows between the nodes. All the
+arrow types of xy are allowed in either mode. For the latest upgrade
+(if any) look at http://www.math.mcgill.ca/barr/papers/.