is the abbreviation of the word ‘logarithm’. common logarithm (brigg’s logarithms). the base is 10. if x < 0, a > 0 and a ≠ 1, then log a x is imaginary. \(\begin{array}{l}{{\log }_{a}}1=0\left( a>0,a\ne 1 \right)\end{array} \) \(\begin{array}{l}{{...