${{\log }_{a}}1=0$
e.g. ${{\log }_{5}}1=0$, ${{\log }_{17.5}}1=0$, $\ln 1=0$
${{\log }_{a}}a=1$
e.g. ${{\log }_{11}}11=1$, ${{\log }_{20.5}}20.5=1$, $\ln e=1$

e.g. ${{\log }_{5}}1=0$, ${{\log }_{17.5}}1=0$, $\ln 1=0$

e.g. ${{\log }_{11}}11=1$, ${{\log }_{20.5}}20.5=1$, $\ln e=1$

Properties to note

Properties to note

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