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File:2-element subsets of 4 elements; array, hexagonal.svg

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English: The six 2-element subsets of a 4-element set in an array
Italiano: Le permutazioni dell'insieme danno un insieme di 24 elementi che possono avere solo il seguente numero d'inversioni: con le rispettive molteplicità

Ogni esagono rappresenta una coppia posizione (i,j) di una generica permutazione nella notazione 1-linea

che ammette un'inversione con associata la coppia valore .
Ogni esagono sono inversioni unitarie
Una coppia di esagoni sono inversioni doppie
...

I 6 esagoni una sestupla inversione e corrisponde all'unica permutazione π=4321
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Watchduck
You can name the author as "T. Piesk", "Tilman Piesk" or "Watchduck".
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This work is ineligible for copyright and therefore in the public domain because it consists entirely of information that is common property and contains no original authorship.
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current00:25, 24 February 2014Thumbnail for version as of 00:25, 24 February 2014298 × 289 (28 KB)Watchduck{{Information |Description ={{en|1=upload forms suck}} |Source ={{own}} |Author =Mate2code |Date = |Permission = |other_versions = }}

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