Word Count : 188

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The function \( f \) is given by: \[ f = \chi_{[0,1]} + 2\chi_{[3,5]} + \chi_{[6,9]} \] where \( \chi_A \) is the characteristic function of the set \( A \). This means: - \( f(x) = 1 \) for \( x \in [0,1] \). - \( ____ ____ ________ ________ __________.
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