Identifier
Values
[1,0] => [1,1,0,0] => [1,0,1,0] => [1,2] => 0
[1,0,1,0] => [1,1,0,1,0,0] => [1,0,1,0,1,0] => [1,2,3] => 0
[1,1,0,0] => [1,1,1,0,0,0] => [1,0,1,1,0,0] => [1,3,2] => 1
[1,0,1,0,1,0] => [1,1,0,1,0,1,0,0] => [1,0,1,0,1,0,1,0] => [1,2,3,4] => 0
[1,0,1,1,0,0] => [1,1,0,1,1,0,0,0] => [1,0,1,0,1,1,0,0] => [1,2,4,3] => 1
[1,1,0,0,1,0] => [1,1,1,0,0,1,0,0] => [1,0,1,1,0,0,1,0] => [1,3,2,4] => 1
[1,1,0,1,0,0] => [1,1,1,0,1,0,0,0] => [1,0,1,1,0,1,0,0] => [1,3,4,2] => 3
[1,1,1,0,0,0] => [1,1,1,1,0,0,0,0] => [1,0,1,1,1,0,0,0] => [1,4,3,2] => 4
[] => [1,0] => [1,0] => [1] => 0
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Description
The vector space dimension of $Ext_A^1(I_o,A)$ when $I_o$ is the tilting module corresponding to the permutation $o$ in the Auslander algebra $A$ of $K[x]/(x^n)$.
Map
promotion
Description
The promotion of the two-row standard Young tableau of a Dyck path.
Dyck paths of semilength $n$ are in bijection with standard Young tableaux of shape $(n^2)$, see Mp00033to two-row standard tableau.
This map is the bijection on such standard Young tableaux given by Schützenberger's promotion. For definitions and details, see [1] and the references therein.
Map
prime Dyck path
Description
Return the Dyck path obtained by adding an initial up and a final down step.
Map
to 312-avoiding permutation
Description
Sends a Dyck path to the 312-avoiding permutation according to Bandlow-Killpatrick.
This map is defined in [1] and sends the area (St000012The area of a Dyck path.) to the inversion number (St000018The number of inversions of a permutation.).