factor

Author	SHA1	Message	Date
John Benediktsson	9cc73c9492	graphs: move to core and simplify. 1. remove add-vertex* and remove-vertex* that contradicted the documentation. 2. graphs use hash-sets of edges instead of hashtables of {edge,edge} pairs. 3. make graphs:closure work like classes:closure, use in classes.	2016-03-21 10:20:38 -07:00
John Benediktsson	50db0745d6	graphs: moving to basis.	2013-03-09 08:31:06 -08:00
Slava Pestov	a96457cecc	Initial import	2007-09-20 18:09:08 -04:00