The ln key is used for calculations of the form log e x. This is called the natural logarithm. In mathematics the natural logarithm log e x is usually written as ln x.

Yet they underlie many physical processes and are never far away in mathematics and science. In a sense, we live in a logarithmic world.

This monthly journal, begun in 1950, is devoted entirely to research in pure and applied mathematics, principally to the publication of original papers of moderate length. A section called Shorter ...