The petossol is equal to \(\lbrace 10,10 (5) 2\rbrace = 10^5\ \&\ 10\) (5-D hypercube of 10's with side length 10) in BEAF.[1] The term was coined by Jonathan Bowers.


Notation Approximation
Bird's array notation \(\{10,10 [6] 2\}\)
Cascading-E notation \(E10\#\text{^}\#\#\#\#\#10\)
Hyperfactorial Array Notation \(10![1,[1,1,6],1,2]\)
Fish function 5 \(F_5(5)\)
Fast-growing hierarchy \(f_{\omega^{\omega^5}}(10)\)
Hardy hierarchy \(H_{\omega^{\omega^{\omega^5}}}(10)\)
Slow-growing hierarchy \(g_{\vartheta(\Omega^{\Omega^4\omega})}(10)\)


  1. Bowers, JonathanInfinity Scrapers. Retrieved January 2013.

See also

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