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$ \lg(\text{VL})

\lg(\text{HL}) $= Man kan logaritmera båda sidor i en ekvation utan att bryta likheten, exempelvis

1 0^{x} = 5 \Leftrightarrow l g (1 0^{x}) = l g (5) .

Man kan enbart logaritmera positiva tal vilket innebär att en ekvation endast kan logaritmeras om både vänster- och högerled är positiva.

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