Fish number 6 (F6) is a number defined by Japanese googologist Fish in 2007.[1] It is largest of the computable Fish numbers.
Fish function 6 uses m(m,n) map.
Definition and growth rate of Fish function 6, \(F_6(x)\), is
\begin{eqnarray*} F_6(x) &:=& m(x,2)m(x,1)(x) \\ F_6(x) &\approx& f_{\zeta_0}(x) \end{eqnarray*}
Then Fish number 6 is defined as: \[F_6 := F_6^{63}(3)\]
Therefore, Fish number 6 is greater than Fish number 5 and is approximately \(f_{\zeta_0+1}(63)\).
Approximations[]
Fish number 6 is comparable to grangol-carta-tethracross \(\approx f_{\zeta_0+1}(100)\).
| Notation | Approximation |
|---|---|
| BEAF (intended) | \(\{63,63,2 (X \uparrow\uparrow X \uparrow 2) 2\}\)[2] |
| Bird's array notation | \(\{63,63,2 [1 \backslash 1 \backslash 2] 2\}\) |
| Bashicu matrix system version 4 | (0,0)(1,1)(2,1)(1,0)[8] |
| Extended Cascading-E notation | E63#^^##63#63 |
| Fast-growing hierarchy | \(f_{\zeta_0+1}(63)\) |
| Hardy hierarchy | \(H_{\zeta_0 \omega}(63)\) |
| Slow-growing hierarchy (using Buchholz's function) | \(g_{\psi_0(\Omega_2^2 + \psi_1(\Omega_2^2))}(63)\) |
Computer programs[]
There are computer programs for calculating Fish number 6 and its variant by Okkuu:
- Okkuu, C++ program for calculating Fish number 6
- Okkuu, C++ program for calculating a version of Fish number 6
Sources[]
- ↑ Fish, Googology in Japan - exploring large numbers (2013)
- ↑ Using particular notation \(\{a,b (X \uparrow\uparrow X \uparrow 2) 2\}\) for \(X \uparrow\uparrow X \uparrow 2 \&\ a\)
See also[]
By Aeton: Okojo numbers · N-growing hierarchy
By 新井 (Arai): Arai's psi function
By aster: White-aster notation · White-aster
By バシク (BashicuHyudora): Primitive sequence number · Pair sequence number · Bashicu matrix system 1/2/3/4 original idea
By ふぃっしゅ (Fish): Fish numbers (Fish number 1 · Fish number 2 · Fish number 3 · Fish number 4 · Fish number 5 · Fish number 6 · Fish number 7 · S map · SS map · s(n) map · m(n) map · m(m,n) map) · Bashicu matrix system 1/2/3/4 formalisation · TR function (I0 function)
By Gaoji: Weak Buchholz's function
By じぇいそん (Jason): Irrational arrow notation · δOCF · δφ · ε function
By 甘露東風 (Kanrokoti): KumaKuma ψ function
By koteitan: Bashicu matrix system 2.3
By mrna: 段階配列表記 · 降下段階配列表記 · 多変数段階配列表記 · SSAN · S-σ
By Naruyoko Naruyo: Y sequence formalisation · ω-Y sequence formalisation
By Nayuta Ito: N primitive · Flan numbers (Flan number 1 · Flan number 2 · Flan number 3 · Flan number 4 version 3 · Flan number 5 version 3) · Large Number Lying on the Boundary of the Rule of Touhou Large Number 4 · Googology Wiki can have an article with any gibberish if it's assigned to a number
By Okkuu: Extended Weak Buchholz's function
By p進大好きbot: Ordinal notation associated to Extended Weak Buchholz's function · Ordinal notation associated to Extended Buchholz's function · Naruyoko is the great · Large Number Garden Number
By たろう (Taro): Taro's multivariable Ackermann function
By ゆきと (Yukito): Hyper primitive sequence system · Y sequence original idea · YY sequence · Y function · ω-Y sequence original idea
By バシク (BashicuHyudora): Bashicu matrix system as a notation template
By じぇいそん (Jason): Shifting definition
By mrna: Side nesting
By Nayuta Ito and ゆきと (Yukito): Difference sequence system
By ふぃっしゅ (Fish): Ackermann function
By koteitan: Ackermann function · Beklemishev's worms · KumaKuma ψ function
By Mitsuki1729: Ackermann function · Graham's number · Conway's Tetratri · Fish number 1 · Fish number 2 · Laver table
By みずどら: White-aster notation
By Naruyoko Naruyo: p進大好きbot's Translation map for pair sequence system and Buchholz's ordinal notation · KumaKuma ψ function · Naruyoko is the great
By 猫山にゃん太 (Nekoyama Nyanta): Flan number 4 version 3 · Fish number 5 · Laver table
By Okkuu: Fish number 1 · Fish number 2 · Fish number 3 · Fish number 5 · Fish number 6
By rpakr: p進大好きbot's ordinal notation associated to Extended Weak Buchholz's function · Standardness decision algorithm for Taranovsky's ordinal notation
By ふぃっしゅ (Fish): Computing last 100000 digits of mega · Approximation method for FGH using Arrow notation · Translation map for primitive sequence system and Cantor normal form
By Kihara: Proof of an estimation of TREE sequence · Proof of the incomparability of Busy Beaver function and FGH associated to Kleene's \(\mathcal{O}\)
By koteitan: Translation map for primitive sequence system and Cantor normal form
By Naruyoko Naruyo: Translation map for Extended Weak Buchholz's function and Extended Buchholz's function
By Nayuta Ito: Comparison of Steinhaus-Moser Notation and Ampersand Notation
By Okkuu: Verification of みずどら's computation program of White-aster notation
By p進大好きbot: Proof of the termination of Hyper primitive sequence system · Proof of the termination of Pair sequence number · Proof of the termination of segements of TR function in the base theory under the assumption of the \(\Sigma_1\)-soundness and the pointwise well-definedness of \(\textrm{TR}(T,n)\) for the case where \(T\) is the formalisation of the base theory
By 小林銅蟲 (Kobayashi Doom): Sushi Kokuu Hen
By koteitan: Dancing video of a Gijinka of Fukashigi · Dancing video of a Gijinka of 久界 · Storyteller's theotre video reading Large Number Garden Number aloud
See also: Template:Googology in Asia