fixed typo
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@ -148,7 +148,7 @@ We have
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\begin{proof}
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We have
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\begin{IEEEeqnarray*}{rCl}
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\phi_{a X + b}(t) &=& \bE[e^{\i t (aX + b)}}]\\
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\phi_{a X + b}(t) &=& \bE[e^{\i t (aX + b)}]\\
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&=& e^{\i t b} \bE[e^{\i t a X}]\\
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&=& e^{\i t b} \phi_X(\frac{t}{a}).
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\end{IEEEeqnarray*}
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