Frances to Michael and others... Here are two papers, on map theory and on graph theory, that seem related to Peircean sign theory and what might be called his mental mapping and graphing within acts of semiosis. They have only been roughly scanned by me, so no critical assay can be made at the present.
"Map-Induced Semiosis" by Mahes Visvalingam http://rcswww.urz.tu-dresden.de/~wolodt/tc-com/pdf/mahes-1a.pdf "Diagrammatic Reasoning and Levels of Schematization" By Michael May http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.26.4418&; rep=rep1&type=pdf
