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``Symmetries of maps and oriented maps via action graphs'' by Tomaz Pisanski (U. Ljubljana)

GASC talk by Tomaz Pisansky:  

We define action graphs as semi-directed graphs in which the edge set is partitioned into directed 2-factors and undirected 1-factors and use them to describe several combinatorial structures, such as maps and oriented maps. The quotient of the action graph with respect to its automorphism group is called the symmetry type graph and is very useful in connection with map symmetries and orientation preserving symmetries. Several usual cases of regular-, chiral-, edge-transitive, vertex-transitive, and other types of maps and oriented maps are revisited. This is work in progress with J\'an Karab\'a\v{s}.

Wednesday, March 4, 2015 at 12:15pm to 1:15pm


Lake Hall , 511

Event Type

Seminar

Departments

COS, Mathematics, Geometry, Algebra, Singularities, Combinatorics (GASC)

Website

http://www.northeastern.edu/cos/mathe...

Sponsoring Organization

Mathematics Department

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