Asymmetrical factorials were developed systematically for the first time by Yates.

There is expanded coverage of factorization, factors, and factorials, and a rewritten and enlarged section on units.

Stirling wrote to De Moivre pointing out some errors that he had made in a table of logarithms of factorials in the book.

In the proof below, we use the fact that e is the sum of the series of inverted factorials.

Besides conversions, the tool calculates percentages, square roots, Roman numerals, remainders after division, factorials, trigonometric functions, logarithm bases and more.

Now Stirling's formula is a classical approximation for the factorial function, and factorials are one way to evaluate binomial coefficients.