Fox and Perfect Sets
Fox Ciel studies number theory. She thinks a non-empty set S contains non-negative integers is perfect if and only if for any ( a can be equal to b), . Where operation xor means exclusive or […]
Perfect Sets
Fox Ciel studies number theory. She thinks a non-empty set S contains non-negative integers is perfect if and only if for any ( a can be equal to b), . Where operation xor means exclusive or […]