InjectivesOfNonMaximalSocleProjectiveDimensionMinusProjectiveInjectives

The indecomposable injective modules whose socle has projective dimension less than the global dimension, less the indecomposable projective-injective modules.

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InjectivesOfNonMaximalSocleProjectiveDimensionMinusProjectiveInjectives(path)The indecomposable injective modules whose socle has projective dimension less than the global dimension, less the indecomposable projective-injective modules.

Typed signatures

Type	Package	Applies
(dyck_path) -> number	combinatorics	always

Domain: Dyck path statistics

Details

• Defined over DyckPath as an expression in _x, evaluated by compute-engine — the definition IS the implementation.
• Takes a DyckPath and nothing else — it reads values against their positions, or walks the orbits, so it needs the bijection. Applying it to a bare list is a type error, not a wrong answer.
• FindStat's St001164. An indecomposable projective is injective when the one before it is no longer than it.

Definition

Epsil, as the implementation runs it.

on DyckPath, over _x

0 if Length(_x) < 1 else Apply(
                                (series: list<integer>) => Apply(
                                                                  (leftSeries: list<integer>) => Apply(
                                                                                                        (dims: list<integer>) => Count(Filter(dims, Function(d < Max(dims), d))) -
                                                                                                                                 Count(Filter(Range(1, Length(_x) / 2 +
                                                                                                                                                       1), Function(leftSeries[v] <= series[v], v))),
                                                                                                        Map(
                                                                                                             Function(Fold(
                                                                                                                            Function(Apply(
                                                                                                                                            (entry: integer) => [a[1], a[2], a[3]] if a[2] == entry else [a[1] + a[2], entry - a[2], a[3] + 1],
                                                                                                                                            series[a[1] + 1],
                                                                                                                                          ), a, b),
                                                                                                                            [v - 1, 1, 0],
                                                                                                                            Range(1, Length(_x) / 2 +
                                                                                                                                     1),
                                                                                                                          )[3], v),
                                                                                                             Range(1, Length(_x) / 2 +
                                                                                                                      1),
                                                                                                           ),
                                                                                                      ),
                                                                  Join(
                                                                        [0],
                                                                        series,
                                                                      ),
                                                                ),
                                Apply(
                                       (h: list<integer>) => Apply(
                                                                    (ups: list<integer>) => Join(Map(
                                                                                                      Function(h[ups[Length(_x) / 2 +
                                                                                                                     1 -
                                                                                                                     t]] +
                                                                                                               1, t),
                                                                                                      Range(1, Length(_x) / 2),
                                                                                                    ), [1]),
                                                                    Filter(
                                                                            Range(1, Length(_x)),
                                                                            Function(_x[i] == 1, i),
                                                                          ),
                                                                  ),
                                       Map(
                                            Function(Sum(Map(
                                                              Function(
                                                                        2 *
                                                                        _x[k] - 1,
                                                                        k,
                                                                      ),
                                                              Range(1, i),
                                                            )), i),
                                            Range(1, Length(_x)),
                                          ),
                                     ),
                              )

Examples

Basic #

the step word $UUDDUD$

live ↗

In$\mathrm{InjectivesOfNonMaximalSocleProjectiveDimensionMinusProjectiveInjectives}({\operatorname{DyckPath}}([1, 1, 0, 0, 1, 0]))$Out$1$

the step word $UDUUDD$

live ↗

In$\mathrm{InjectivesOfNonMaximalSocleProjectiveDimensionMinusProjectiveInjectives}({\operatorname{DyckPath}}([1, 0, 1, 1, 0, 0]))$Out$1$

Properties #

FindStat's value for [1,0]

live ↗

In$\mathrm{CombinatorialStat}({\operatorname{DyckPath}}([1, 0]), \text{InjectivesOfNonMaximalSocleProjectiveDimensionMinusProjectiveInjectives})$Out$0$

Known value · FindStat St001164

FindStat's value for [1,0,1,0]

live ↗

In$\mathrm{CombinatorialStat}({\operatorname{DyckPath}}([1, 0, 1, 0]), \text{InjectivesOfNonMaximalSocleProjectiveDimensionMinusProjectiveInjectives})$Out$0$

Known value · FindStat St001164

FindStat's value for [1,1,0,0]

live ↗

In$\mathrm{CombinatorialStat}({\operatorname{DyckPath}}([1, 1, 0, 0]), \text{InjectivesOfNonMaximalSocleProjectiveDimensionMinusProjectiveInjectives})$Out$0$

Known value · FindStat St001164

About

Examples	5
Crosswalk	FindStat