OccurrencesOf13Over2Closers2Arc13

Occurrences of the pattern 13/2 with 2 the greatest element of its block and 1 and 3 consecutive in one block.

✓ checked against that system · ! checked, with disagreements (hover a chip)FindStatSt000585via SetPartition✓↗

OccurrencesOf13Over2Closers2Arc13(partition)Occurrences of the pattern 13/2 with 2 the greatest element of its block and 1 and 3 consecutive in one block.

Typed signatures

Type	Package	Applies
(set_partition) -> number	combinatorics	always

Domain: Set partition statistics

Details

• Defined over SetPartition as an expression in _x, evaluated by compute-engine — the definition IS the implementation.
• Takes a SetPartition 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.

Definition

Epsil, as the implementation runs it.

on SetPartition, over _x

0 if Length(Flatten(_x)) < 3 else Sum(Map(
                                           Function(Sum(Map(Function(Count(Filter(
                                                                                   Range(b + 1, Length(Flatten(_x))),
                                                                                   Function(Sum(Map(
                                                                                                     Function(q if Contains(_x[q], a) else 0, q),
                                                                                                     Range(1, Length(_x)),
                                                                                                   )) ==
                                                                                            Sum(Map(
                                                                                                     Function(q if Contains(_x[q], c) else 0, q),
                                                                                                     Range(1, Length(_x)),
                                                                                                   )) &&
                                                                                            Abs(Sum(Map(
                                                                                                         Function(q if Contains(_x[q], a) else 0, q),
                                                                                                         Range(1, Length(_x)),
                                                                                                       )) -
                                                                                                Sum(Map(
                                                                                                         Function(q if Contains(_x[q], b) else 0, q),
                                                                                                         Range(1, Length(_x)),
                                                                                                       ))) >
                                                                                            0 &&
                                                                                            Contains(Map(Function(Last(b), b), _x), b) &&
                                                                                            Sum(Map(
                                                                                                     Function(q if Contains(_x[q], a) else 0, q),
                                                                                                     Range(1, Length(_x)),
                                                                                                   )) ==
                                                                                            Sum(Map(
                                                                                                     Function(q if Contains(_x[q], c) else 0, q),
                                                                                                     Range(1, Length(_x)),
                                                                                                   )) &&
                                                                                            Count(Filter(
                                                                                                          Range(1, Length(Flatten(_x))),
                                                                                                          Function(e > a &&
                                                                                                                   e < c &&
                                                                                                                   Sum(Map(
                                                                                                                            Function(q if Contains(_x[q], e) else 0, q),
                                                                                                                            Range(1, Length(_x)),
                                                                                                                          )) ==
                                                                                                                   Sum(Map(
                                                                                                                            Function(q if Contains(_x[q], a) else 0, q),
                                                                                                                            Range(1, Length(_x)),
                                                                                                                          )), e),
                                                                                                        )) ==
                                                                                            0, c),
                                                                                 )), b), Range(a + 1, Length(Flatten(_x)) - 1))), a),
                                           Range(1, Length(Flatten(_x)) - 2),
                                         ))

Examples

Basic #

the partition $\{1,3\} \mid \{2\}$

live ↗

In$\mathrm{OccurrencesOf13Over2Closers2Arc13}({\operatorname{SetPartition}}([[1, 3], [2]]))$Out$1$

the partition $\{1\} \mid \{2,4\} \mid \{3\}$

live ↗

In$\mathrm{OccurrencesOf13Over2Closers2Arc13}({\operatorname{SetPartition}}([[1], [2, 4], [3]]))$Out$1$

Properties #

FindStat's value for {{1,2}}

live ↗

In$\mathrm{CombinatorialStat}({\operatorname{SetPartition}}([[1, 2]]), \text{OccurrencesOf13Over2Closers2Arc13})$Out$0$

Known value · FindStat St000585

FindStat's value for {{1,2,3}}

live ↗

In$\mathrm{CombinatorialStat}({\operatorname{SetPartition}}([[1, 2, 3]]), \text{OccurrencesOf13Over2Closers2Arc13})$Out$0$

Known value · FindStat St000585

FindStat's value for {{1},{2}}

live ↗

In$\mathrm{CombinatorialStat}({\operatorname{SetPartition}}([[1], [2]]), \text{OccurrencesOf13Over2Closers2Arc13})$Out$0$

Known value · FindStat St000585

About

Examples	5
Crosswalk	FindStat