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Googology Wiki
Googology Wiki is an online encyclopedia and community dedicated to large numbers. Welcome to the Internet's most comprehensive database of large numbers and fastgrowing functions. We have made 11,780 articles since December 
List of googolisms
List of googolisms Class 0 and 1, Class 2, Class 3, Class 4, Class 5, Tetration level, Uparrow notation level, Linear omega level, Quadratic omega level, Polynomial omega level, Exponentiated linear omega level, Exponentiated 
Rayo's number
Rayo's number is one of the largest named numbers, coined in a large number battle pitting Agustín Rayo against Adam Elga on 26 January 2007. Rayo's number is, in Rayo's own words 
Millillion
A millillion (alternately millinillion, milliatillion or milletillion ) is equal to 10 in the short scale, or 10 in the long scale (this number is also called Platillion). It is made by combining "mille" (1,000 
TREE sequence
The TREE sequence is a fastgrowing function TREE[n] arising out of graph theory, devised by mathematical logician Harvey Friedman. Friedman proved that the function eventually dominates all recursive functions provably total in the 
Graham's number
Graham's number\(G_{64}\) is a famous large number, defined by Ronald Graham. Using Uparrow notation, it is defined as the 64th term of the following sequence: 
Googology
Googology is the study and nomenclature of large numbers. One who studies and invents large numbers and large number names is known as a googologist. A mathematical object relevant to googology is known as a 
List of googolisms/Class 0 and 1
List of googolisms Class 0 and 1, Class 2, Class 3, Class 4, Class 5, Tetration level, Uparrow notation level, Linear omega level, Quadratic omega level, Polynomial omega level, Exponentiated linear omega level, Exponentiated 
List of googolisms/Uncomputable numbers
List of googolisms Class 0 and 1, Class 2, Class 3, Class 4, Class 5, Tetration level, Uparrow notation level, Linear omega level, Quadratic omega level, Polynomial omega level, Exponentiated linear omega level, Exponentiated 
List of googolisms/Linear omega level
List of googolisms Class 0 and 1, Class 2, Class 3, Class 4, Class 5, Tetration level, Uparrow notation level, Linear omega level, Quadratic omega level, Polynomial omega level, Exponentiated linear omega level, Exponentiated 
List of googolisms/Uparrow notation level
List of googolisms Class 0 and 1, Class 2, Class 3, Class 4, Class 5, Tetration level, Uparrow notation level, Linear omega level, Quadratic omega level, Polynomial omega level, Exponentiated linear omega level, Exponentiated 
List of googolisms/Class 2
List of googolisms Class 0 and 1, Class 2, Class 3, Class 4, Class 5, Tetration level, Uparrow notation level, Linear omega level, Quadratic omega level, Polynomial omega level, Exponentiated linear omega level, Exponentiated 
Busy beaver function
The busy beaver function (a.k.a. BB function or Radó's sigma function, denoted\(\Sigma(n)\) or\(\text{BB}(n)\)), is a distinctive fastgrowing function from computability theory. It is the most well 
Googol
Googol is a wellknown large number, equal to 10 or 1 followed by 100 zeroes. It is also called "ten duotrigintillion" using the short scale. It is the namesake of googology. Coined in the 
Fastgrowing hierarchy
The fastgrowing hierarchy (FGH for short) is a certain hierarchy mapping ordinals\(\alpha\) (below the supremum\(\mu\) of a fixed system of fundamental sequences) to a set of functions, which generated from fastgrowing 
List of googolisms/Tetration level
List of googolisms Class 0 and 1, Class 2, Class 3, Class 4, Class 5, Tetration level, Uparrow notation level, Linear omega level, Quadratic omega level, Polynomial omega level, Exponentiated linear omega level, Exponentiated 
Bowers' Exploding Array Function
Bowers Exploding Array Function (BEAF ) is a notation for very large numbers invented by Jonathan Bowers, similar to chained arrow notation, but far stronger. It is a superset of array notation and extended array notation 
List of googolisms/Higher computable level
List of googolisms Class 0 and 1, Class 2, Class 3, Class 4, Class 5, Tetration level, Uparrow notation level, Linear omega level, Quadratic omega level, Polynomial omega level, Exponentiated linear omega level, Exponentiated 
List of googolisms/Class 3
List of googolisms Class 0 and 1, Class 2, Class 3, Class 4, Class 5, Tetration level, Uparrow notation level, Linear omega level, Quadratic omega level, Polynomial omega level, Exponentiated linear omega level, Exponentiated 
List of functions
Be careful that for computable functions A and B, even if the weakest theory among those which are known to prove the totality of B can prove the totality of A, B does not necessarily 
List of googolisms/Exponentiated linear omega level
List of googolisms Class 0 and 1, Class 2, Class 3, Class 4, Class 5, Tetration level, Uparrow notation level, Linear omega level, Quadratic omega level, Polynomial omega level, Exponentiated linear omega level, Exponentiated 
Large Number Garden Number
This is an exceptional article which is allowed to refer to a blog post as the first source of the title. Please be careful that a blog post as well as a personal web site 
BIG FOOT
BIG FOOT is a counterpart of Rayo's number based on an extended version of the language of firstorder set theory. As a result, it was considered to be among the largest named numbers 
Loader's number
Loader's number is the output of loader.c, a C program by Ralph Loader that came in first place for the Bignum Bakeoff contest, whose objective was to write a C program (in 512 
Oblivion
Oblivion is a large googolism coined by Jonathan Bowers. It is defined as "the largest number defined using no more than a kungulus symbols in some K(gongulus) system", where a "K(n) system" is
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