Factorion Math

The math functions used by factorion. (Factorials and related functions) All functions that take [Integer]s, but internally use [Float]s, not only have a float alternative, but also take in a precision.

This crate uses [rug] in its interface. It is re-exported for convenience.

Features

• k-factorials in exact, float, approximate, approximate digits
• termials in exact, float, approximate, approximate digits
• k-termials in exact, approximate, approximate digits
• subfactorials in exact, approximate, approximate digits

Calculations are split in areas:

• exact: integer calculation (accuracy)
• float: float calculation (decimals)
• approximate: approximation of integer calculation using float as a * 10^b (large numbers)
• approximate digits: approximation of integer calculation using float as 10^b (extremely large numbers)

Formulas and their derivations are available in MATH.md