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A map which is non-orientable or has non-empty boundary has acanonical double cover which is orientable and has empty boundary.The map is called stable if every automorphism of this cover is a liftof an automorphism of the map. This note describes several innitefamilies of unstable maps, and relates them to similar phenomena forgraphs, hypermaps and Klein surfaces.
How to Cite
Jones, G. (2019). Unstable maps. Acta Mathematica Universitatis Comenianae, , 1-10. Retrieved from http://www.iam.fmph.uniba.sk/amuc/ojs/index.php/amuc/article/view/1030/657