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    π-Base

    Visit database

    searchable online

    source code

    Area
    general topology
    Active
    2014–present
    License
    CC BY-SA 4.0

    A community database of topological counterexamples

    James Dabbs, Steven Clontz

    A community database of topological counterexamples

    Updated: May 7, 2026

    MathBases - Of, by, and for mathematical databases