Common bases: log10(x) (common), ln(x) = loge(x) (natural), log2(x) (binary).
Change of base: logb(x) = ln(x)/ln(b) = logk(x)/logk(b).
Key values: logb(1)=0; logb(b)=1.
Rules: log(xy)=log x + log y; log(x/y)=log x โ log y; log(xk)=kยทlog x.
Signs: If 0<x<1 then logb(x)<0 (for b>1). If x>1 then logb(x)>0.
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