. . . . "Banach\u2013Tarski paradox" . . . . . . . "two smaller copies" . . . . . . "Banach-Tarski paradox" . . "Banach-Tarski decomposition" . "can be deduced" . . . . "Banach\u2013Tarski paradox" . . . . . "equi-decomposable" . . . . .