engleski

Co-c.e. spheres and cells in computable metric spaces

We investigate conditions under which a co-computably enumerable set in a computable metric space is computable. Using higher-dimensional chains and spherical chains we prove that in each computable metric space which is locally computable each co-computably enumerable sphere is computable and each co-c.e. cell with co-c.e. boundary sphere is computable.

computable metric space ; computable set ; co-c.e. set ; n-chain ; spherical n-chain

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