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Llull connected his "basic concepts" with lines, and prescribed that
the lines had to be followed to combine the concepts and derive the
consequences. This was new. Not now, though; we have a name for
the device Llull invented: we call it a graph. The two amazing
things about this are, first, that Llull gave a dual isomorphic
variety of it: he compiled the graph's information in the form of a
two-entry table (just what we term the adjacency matrix of the graph)
and, second, that Llull's graphs were not meant as mere
concept-structuring or taxonomic (tree-structured concepts were
available since late Roman times) but were conceived rather as a
present-day's "semantic network" and intended to be "followed",
i.e. dynamically executed as though it were a truly fact-finding
"program" or a decision tree (as in AI) in a decision procedure.
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