In the notation log x with no base written, which base is meant?

1. A logarithm with no written base follows a standing convention. 2. That convention is base 10, and it is called the common logarithm. 3. Base e has its own short form written as ln, the natural logarithm. 4. So log x on its own means log base 10 of x. _Source: OpenStax Intermediate Algebra (CC BY 4.0), section 10.3 Evaluate and Graph Logarithmic Functions_