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Duoltetarto is equal to 25[2] using Ampersand Notation. [1] The term was coined by Googology Wiki user CompactStar. It is equal to 25[1][1]...[1][1] with 25 copies of [1] in Ampersand Notation.

Etymology[]

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

Approximations[]

Notation Approximation
Arrow notation \(25 \uparrow\uparrow\uparrow 26\)
Hyper-E notation \(E36\#25\#25\)
Cascading-E notation \(E36\#25\#25\)
Steinhaus-Moser Notation 25[5] (exact)
Fast-growing hierarchy \(f_{4}(26)\)
Hardy hierarchy \(H_{\omega^{4}}(26)\)
Slow-growing hierarchy \(g_{\zeta_{0}}(25)\)

Sources[]

  1. CompactStar. Ampersand Notation numbers. Retrieved Aug 21, 2022.

See also[]

Basic Ampersand Notation

Emptol group:
Unol group:
Duol group:
duoltetarto · duolmiso · duol · duoldyo