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Line 2: * As a synonym for [[indicator function]], that is the function ::<math>\~~mmathbf~~mathbf{1}_A\colon X \to \{0, 1\},</math> :which for a given subset ''A'' of ''X'', has value 1 at points of ''A'' and 0 at points of ''X'' − ''A''.

Characteristic function: Difference between revisions