Coequalisers of formal topology

Author Erik Palmgren

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Erik Palmgren

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Erik Palmgren. Coequalisers of formal topology. In Mathematics, Algorithms, Proofs. Dagstuhl Seminar Proceedings, Volume 5021, pp. 1-12, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)


We give a predicative construction of quotients of formal topologies. Along with earlier results on the match up between of continuous functions on real numbers (in the sense of Bishop's constructive mathematics) and approximable mappings on the formal space of reals, we argue that formal topology gives an adequate foundation for constructive algebraic topology, also in the predicative sense. Predicativity is of essence when formalising the subject in logical frameworks based on Martin-Löf type theories.
  • Formal topology
  • type theory


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