Quote: a state space of regions and boundaries forms a topology of open and closed points; isomorphic with undirected Petri nets

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So we see that (m) state-spaces are not … [the intersections of all components of any open set is also an open set] … Topologies with this property are called elementary. … [p. 21] Topologies with the property that every point … [p. 22] It follows, then, that primitive and elementary … [undirected petri nets] on the other, are inter- convertible structures! For this reason … [from Petri ca 1973]   Google-1   Google-2

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