Hyperoperator

En hyperoperator er en aritmetisk operator, som kan beskrives som gentagelser af den "lavere" hyperoperator. Hyperoperatoren af grad-0 er efterfølger-funktionen (f(x)=x+1) dvs. at a[0]b=a+1 (uafhængig af b), derefter følger hyperoperatoren af første grad, som gentager efterfølger-funktionen (adderer 1) på tallet, a, b gange, altså a[1]b=a+b.

Følgen af hyperoperatorer er efterfølger-funktionen (a+1), addition (a+b), multiplikation (ab), potens (ab), tetration (ba) osv.

En hyperoperator af n. grad defineres med den rekursive funktion:

Der eksisterer mange notationer til at vise hyperoperatorer f.eks. notationen med kantede parenteser og Knuths pil-notation.

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