Natural logarithm

Options analysis. The natural logarithm ln(x) is the logarithm to the base ‘e’, and mathematically the inverse function of the exponential function e^x.

So for example ln(100) = 4.60517... And e^4.60517... = 100

Also known for short as the 'natural log'. Also sometimes known - loosely - as the 'Napierian logarithm'.

(Not to be confused with Lognormal, which is different.)

See also

• Exponential
• Exponential function
• Logarithm
• Lognormal
• Napierian logarithm
• Volatility