This is an example of a library. You may see a list of other libraries used on Rosetta Code at Category:Solutions by Library.
The file builtins/bigatom.e as included in the standard distribution contains routines for performing arbitrary precision maths.
The following are all known uses of bigatom.e on rosettacode.
Pages in category "Bigatom"
The following 17 pages are in this category, out of 17 total.