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Let f(x) be defined for all x>0 and be continued . Let f(x) satisfy f(xy)=f(x)f(y) for all x,y and f(e)=1$ Then

\begin{array}{1 1} f(x) \;is\;bounded  \\ f(\frac{1]{x})=>0\;and\;x=0   \\ xf(x)=>1\;as\;x=0  \\f(x) =\log x   \end{array}

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