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SphericalSimpleModules on DyckPath ​

The simple modules with Ext^i(S, A) zero for 0 < i < the projective dimension of S; those of projective dimension at most one count.

On DyckPath

FindStat's St001994.

Called as CombinatorialStat(x, "SphericalSimpleModules"). The head's page has its examples.

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FindStat St001994

The number of simple spherical modules of the corresponding linear Nakayama algebra.

ObjectValue
[1,0]2
[1,0,1,0]3
[1,1,0,0]3
[1,0,1,0,1,0]4
[1,0,1,1,0,0]4
[1,1,0,0,1,0]4
[1,1,0,1,0,0]4
[1,1,1,0,0,0]4

Data from FindStat, the combinatorial statistic finder; the page at findstat.org/St001994 has the rest.