The Banach–Tarski Paradox
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Math topics:
InfinityCountable setUncountable setHilbert's paradox of the Grand HotelElementary geometryLine (geometry)Point (geometry)SphereCardinal numbersCardinalityFinite setInfinite setMathematical objects1 (number)Set (mathematics)Natural numberMathematicsSequenceBijectionReal numberNumbersAdditionDecimalNumber