The abbreviation log x is often used when the intended base can be inferred based on the context or discipline, or when the base is indeterminate or immaterial. On a calculator it is the "log" button. This free log calculator solves for the unknown portions of a logarithmic expression using base e, 2, 10, or any other desired base.
The log calculator (logarithm) calculates the value of a logarithm with an arbitrary base. Generally, when someone says (or writes) "log" without specifying the base, the convention is to assume base 10. However, there are those who refer to the natural log (ln), as "log." as such, it is important.
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