lnFG
lnFG is a compact notation encountered in mathematics and related fields. It most often refers to the natural logarithm of the product FG, where F and G denote positive real numbers or positive-valued functions and FG represents their product.
Under this interpretation, ln(FG) = ln F + ln G, provided F > 0 and G > 0. If F
Notation note: lnFG without parentheses can be ambiguous, as it could be read as ln(F)G or as
In calculus and analysis, the derivative of ln(FG) with respect to a variable x, assuming F and
Historically, the natural logarithm is denoted by ln, a notation popularized in the 18th century, following
See also: logarithm, natural logarithm, logarithmic properties.