## Quick Reference

The antilogarithm of *x*, denoted by antilog *x*, is the number whose logarithm is equal to *x*. For example, suppose that common logarithm tables are used to calculate 2.75×3.12. Then, approximately, log 2.75=0.4393 and log 3.12=0.4942 and 0.4393+0.4942=0.9335. Now antilog 0.9335 is required and, from tables, the answer 8.58 is obtained. Now that logarithm tables have been superseded by calculators, the term ‘antilog’ is little used. If *y* is the number whose logarithm is *x*, then log_{a}*y*=*x*. This is equivalent to *y*=*a*^{x} (from the definition of logarithm). So, if base *a* is being used, antilog_{a}*x* is identical with *a*^{x}; for common logarithms, antilog_{10}*x* is just 10^{x}, and this notation is preferable.

*Subjects:*
Mathematics.