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Unoltetarto is equal to 25[1] using Ampersand Notation. [1] The term was coined by Googology Wiki user CompactStar. It is equal to 25[][]...[][] with 25 copies of [] in Ampersand Notation.

Etymology[]

The name is derived from the number unol and the Greek-based suffix tetarto, signifying 1/4.

Approximations[]

Notation Approximation
Arrow notation \(25\uparrow\uparrow26\)
Hyper-E notation \(E36\#25\)
Cascading-E notation \(E36\#25\)
Steinhaus-Moser Notation 25[4] (exact)
Fast-growing hierarchy \(f_{3}(26)\)
Hardy hierarchy \(H_{\omega^{3}}(26)\)
Slow-growing hierarchy \(g_{\varepsilon_{0}}(27)\)

Sources[]

  1. CompactStar. Ampersand Notation numbers. Retrieved Jul 23, 2022.

See also[]

Basic Ampersand Notation

Emptol group:
Unol group:
Duol group: