## axiom of choice ## axiom of countable choice ## axiom of dependent choice ### branched pruned tree (descriptive set theory) ### Baire category theorem ## axiom of multiple choice ## References * Lev D. Beklemishev, the axiom of choice * Horst Herrlich, axiom of choice * Herman Rubin, equivalents of the axiom of choice II * Gregory H. Moore, Zermelo's axiom of choice: Its origins, development, and influence * Thomas Jech, set theory