Identifier
-
Mp00081:
Standard tableaux
—reading word permutation⟶
Permutations
Mp00067: Permutations —Foata bijection⟶ Permutations
Mp00223: Permutations —runsort⟶ Permutations
St000646: Permutations ⟶ ℤ
Values
[[1,2]] => [1,2] => [1,2] => [1,2] => 0
[[1],[2]] => [2,1] => [2,1] => [1,2] => 0
[[1,2,3]] => [1,2,3] => [1,2,3] => [1,2,3] => 0
[[1,3],[2]] => [2,1,3] => [2,1,3] => [1,3,2] => 1
[[1,2],[3]] => [3,1,2] => [1,3,2] => [1,3,2] => 1
[[1],[2],[3]] => [3,2,1] => [3,2,1] => [1,2,3] => 0
[[1,2,3,4]] => [1,2,3,4] => [1,2,3,4] => [1,2,3,4] => 0
[[1,3,4],[2]] => [2,1,3,4] => [2,1,3,4] => [1,3,4,2] => 1
[[1,2,4],[3]] => [3,1,2,4] => [1,3,2,4] => [1,3,2,4] => 2
[[1,2,3],[4]] => [4,1,2,3] => [1,2,4,3] => [1,2,4,3] => 1
[[1,3],[2,4]] => [2,4,1,3] => [2,1,4,3] => [1,4,2,3] => 1
[[1,2],[3,4]] => [3,4,1,2] => [1,3,4,2] => [1,3,4,2] => 1
[[1,4],[2],[3]] => [3,2,1,4] => [3,2,1,4] => [1,4,2,3] => 1
[[1,3],[2],[4]] => [4,2,1,3] => [2,4,1,3] => [1,3,2,4] => 2
[[1,2],[3],[4]] => [4,3,1,2] => [1,4,3,2] => [1,4,2,3] => 1
[[1],[2],[3],[4]] => [4,3,2,1] => [4,3,2,1] => [1,2,3,4] => 0
[[1,2,3,4,5]] => [1,2,3,4,5] => [1,2,3,4,5] => [1,2,3,4,5] => 0
[[1,3,4,5],[2]] => [2,1,3,4,5] => [2,1,3,4,5] => [1,3,4,5,2] => 1
[[1,2,4,5],[3]] => [3,1,2,4,5] => [1,3,2,4,5] => [1,3,2,4,5] => 2
[[1,2,3,5],[4]] => [4,1,2,3,5] => [1,2,4,3,5] => [1,2,4,3,5] => 2
[[1,2,3,4],[5]] => [5,1,2,3,4] => [1,2,3,5,4] => [1,2,3,5,4] => 1
[[1,3,5],[2,4]] => [2,4,1,3,5] => [2,1,4,3,5] => [1,4,2,3,5] => 2
[[1,2,5],[3,4]] => [3,4,1,2,5] => [1,3,4,2,5] => [1,3,4,2,5] => 2
[[1,3,4],[2,5]] => [2,5,1,3,4] => [2,1,3,5,4] => [1,3,5,2,4] => 3
[[1,2,4],[3,5]] => [3,5,1,2,4] => [1,3,2,5,4] => [1,3,2,5,4] => 2
[[1,2,3],[4,5]] => [4,5,1,2,3] => [1,2,4,5,3] => [1,2,4,5,3] => 1
[[1,4,5],[2],[3]] => [3,2,1,4,5] => [3,2,1,4,5] => [1,4,5,2,3] => 1
[[1,3,5],[2],[4]] => [4,2,1,3,5] => [2,4,1,3,5] => [1,3,5,2,4] => 3
[[1,2,5],[3],[4]] => [4,3,1,2,5] => [1,4,3,2,5] => [1,4,2,5,3] => 2
[[1,3,4],[2],[5]] => [5,2,1,3,4] => [2,1,5,3,4] => [1,5,2,3,4] => 1
[[1,2,4],[3],[5]] => [5,3,1,2,4] => [1,3,5,2,4] => [1,3,5,2,4] => 3
[[1,2,3],[4],[5]] => [5,4,1,2,3] => [1,2,5,4,3] => [1,2,5,3,4] => 1
[[1,4],[2,5],[3]] => [3,2,5,1,4] => [3,2,1,5,4] => [1,5,2,3,4] => 1
[[1,3],[2,5],[4]] => [4,2,5,1,3] => [2,4,1,5,3] => [1,5,2,4,3] => 2
[[1,2],[3,5],[4]] => [4,3,5,1,2] => [1,4,3,5,2] => [1,4,2,3,5] => 2
[[1,3],[2,4],[5]] => [5,2,4,1,3] => [2,1,5,4,3] => [1,5,2,3,4] => 1
[[1,2],[3,4],[5]] => [5,3,4,1,2] => [1,3,5,4,2] => [1,3,5,2,4] => 3
[[1,5],[2],[3],[4]] => [4,3,2,1,5] => [4,3,2,1,5] => [1,5,2,3,4] => 1
[[1,4],[2],[3],[5]] => [5,3,2,1,4] => [3,5,2,1,4] => [1,4,2,3,5] => 2
[[1,3],[2],[4],[5]] => [5,4,2,1,3] => [2,5,4,1,3] => [1,3,2,5,4] => 2
[[1,2],[3],[4],[5]] => [5,4,3,1,2] => [1,5,4,3,2] => [1,5,2,3,4] => 1
[[1],[2],[3],[4],[5]] => [5,4,3,2,1] => [5,4,3,2,1] => [1,2,3,4,5] => 0
[[1,2,3,4,5,6]] => [1,2,3,4,5,6] => [1,2,3,4,5,6] => [1,2,3,4,5,6] => 0
[[1,3,4,5,6],[2]] => [2,1,3,4,5,6] => [2,1,3,4,5,6] => [1,3,4,5,6,2] => 1
[[1,2,4,5,6],[3]] => [3,1,2,4,5,6] => [1,3,2,4,5,6] => [1,3,2,4,5,6] => 2
[[1,2,3,5,6],[4]] => [4,1,2,3,5,6] => [1,2,4,3,5,6] => [1,2,4,3,5,6] => 2
[[1,2,3,4,6],[5]] => [5,1,2,3,4,6] => [1,2,3,5,4,6] => [1,2,3,5,4,6] => 2
[[1,2,3,4,5],[6]] => [6,1,2,3,4,5] => [1,2,3,4,6,5] => [1,2,3,4,6,5] => 1
[[1,3,5,6],[2,4]] => [2,4,1,3,5,6] => [2,1,4,3,5,6] => [1,4,2,3,5,6] => 2
[[1,2,5,6],[3,4]] => [3,4,1,2,5,6] => [1,3,4,2,5,6] => [1,3,4,2,5,6] => 2
[[1,3,4,6],[2,5]] => [2,5,1,3,4,6] => [2,1,3,5,4,6] => [1,3,5,2,4,6] => 4
[[1,2,4,6],[3,5]] => [3,5,1,2,4,6] => [1,3,2,5,4,6] => [1,3,2,5,4,6] => 3
[[1,2,3,6],[4,5]] => [4,5,1,2,3,6] => [1,2,4,5,3,6] => [1,2,4,5,3,6] => 2
[[1,3,4,5],[2,6]] => [2,6,1,3,4,5] => [2,1,3,4,6,5] => [1,3,4,6,2,5] => 3
[[1,2,4,5],[3,6]] => [3,6,1,2,4,5] => [1,3,2,4,6,5] => [1,3,2,4,6,5] => 3
[[1,2,3,5],[4,6]] => [4,6,1,2,3,5] => [1,2,4,3,6,5] => [1,2,4,3,6,5] => 2
[[1,2,3,4],[5,6]] => [5,6,1,2,3,4] => [1,2,3,5,6,4] => [1,2,3,5,6,4] => 1
[[1,4,5,6],[2],[3]] => [3,2,1,4,5,6] => [3,2,1,4,5,6] => [1,4,5,6,2,3] => 1
[[1,3,5,6],[2],[4]] => [4,2,1,3,5,6] => [2,4,1,3,5,6] => [1,3,5,6,2,4] => 3
[[1,2,5,6],[3],[4]] => [4,3,1,2,5,6] => [1,4,3,2,5,6] => [1,4,2,5,6,3] => 2
[[1,3,4,6],[2],[5]] => [5,2,1,3,4,6] => [2,1,5,3,4,6] => [1,5,2,3,4,6] => 2
[[1,2,4,6],[3],[5]] => [5,3,1,2,4,6] => [1,3,5,2,4,6] => [1,3,5,2,4,6] => 4
[[1,2,3,6],[4],[5]] => [5,4,1,2,3,6] => [1,2,5,4,3,6] => [1,2,5,3,6,4] => 2
[[1,3,4,5],[2],[6]] => [6,2,1,3,4,5] => [2,1,3,6,4,5] => [1,3,6,2,4,5] => 3
[[1,2,4,5],[3],[6]] => [6,3,1,2,4,5] => [1,3,2,6,4,5] => [1,3,2,6,4,5] => 2
[[1,2,3,5],[4],[6]] => [6,4,1,2,3,5] => [1,2,4,6,3,5] => [1,2,4,6,3,5] => 3
[[1,2,3,4],[5],[6]] => [6,5,1,2,3,4] => [1,2,3,6,5,4] => [1,2,3,6,4,5] => 1
[[1,3,5],[2,4,6]] => [2,4,6,1,3,5] => [2,1,4,3,6,5] => [1,4,2,3,6,5] => 2
[[1,2,5],[3,4,6]] => [3,4,6,1,2,5] => [1,3,4,2,6,5] => [1,3,4,2,6,5] => 2
[[1,3,4],[2,5,6]] => [2,5,6,1,3,4] => [2,1,3,5,6,4] => [1,3,5,6,2,4] => 3
[[1,2,4],[3,5,6]] => [3,5,6,1,2,4] => [1,3,2,5,6,4] => [1,3,2,5,6,4] => 2
[[1,2,3],[4,5,6]] => [4,5,6,1,2,3] => [1,2,4,5,6,3] => [1,2,4,5,6,3] => 1
[[1,4,6],[2,5],[3]] => [3,2,5,1,4,6] => [3,2,1,5,4,6] => [1,5,2,3,4,6] => 2
[[1,3,6],[2,5],[4]] => [4,2,5,1,3,6] => [2,4,1,5,3,6] => [1,5,2,4,3,6] => 3
[[1,2,6],[3,5],[4]] => [4,3,5,1,2,6] => [1,4,3,5,2,6] => [1,4,2,6,3,5] => 3
[[1,3,6],[2,4],[5]] => [5,2,4,1,3,6] => [2,1,5,4,3,6] => [1,5,2,3,6,4] => 2
[[1,2,6],[3,4],[5]] => [5,3,4,1,2,6] => [1,3,5,4,2,6] => [1,3,5,2,6,4] => 3
[[1,4,5],[2,6],[3]] => [3,2,6,1,4,5] => [3,2,1,4,6,5] => [1,4,6,2,3,5] => 3
[[1,3,5],[2,6],[4]] => [4,2,6,1,3,5] => [2,4,1,3,6,5] => [1,3,6,2,4,5] => 3
[[1,2,5],[3,6],[4]] => [4,3,6,1,2,5] => [1,4,3,2,6,5] => [1,4,2,6,3,5] => 3
[[1,3,4],[2,6],[5]] => [5,2,6,1,3,4] => [2,1,5,3,6,4] => [1,5,2,3,6,4] => 2
[[1,2,4],[3,6],[5]] => [5,3,6,1,2,4] => [1,3,5,2,6,4] => [1,3,5,2,6,4] => 3
[[1,2,3],[4,6],[5]] => [5,4,6,1,2,3] => [1,2,5,4,6,3] => [1,2,5,3,4,6] => 2
[[1,3,5],[2,4],[6]] => [6,2,4,1,3,5] => [2,1,4,6,3,5] => [1,4,6,2,3,5] => 3
[[1,2,5],[3,4],[6]] => [6,3,4,1,2,5] => [1,3,4,6,2,5] => [1,3,4,6,2,5] => 3
[[1,3,4],[2,5],[6]] => [6,2,5,1,3,4] => [2,1,3,6,5,4] => [1,3,6,2,4,5] => 3
[[1,2,4],[3,5],[6]] => [6,3,5,1,2,4] => [1,3,2,6,5,4] => [1,3,2,6,4,5] => 2
[[1,2,3],[4,5],[6]] => [6,4,5,1,2,3] => [1,2,4,6,5,3] => [1,2,4,6,3,5] => 3
[[1,5,6],[2],[3],[4]] => [4,3,2,1,5,6] => [4,3,2,1,5,6] => [1,5,6,2,3,4] => 1
[[1,4,6],[2],[3],[5]] => [5,3,2,1,4,6] => [3,5,2,1,4,6] => [1,4,6,2,3,5] => 3
[[1,3,6],[2],[4],[5]] => [5,4,2,1,3,6] => [2,5,4,1,3,6] => [1,3,6,2,5,4] => 3
[[1,2,6],[3],[4],[5]] => [5,4,3,1,2,6] => [1,5,4,3,2,6] => [1,5,2,6,3,4] => 2
[[1,4,5],[2],[3],[6]] => [6,3,2,1,4,5] => [3,2,6,1,4,5] => [1,4,5,2,6,3] => 2
[[1,3,5],[2],[4],[6]] => [6,4,2,1,3,5] => [2,4,6,1,3,5] => [1,3,5,2,4,6] => 4
[[1,2,5],[3],[4],[6]] => [6,4,3,1,2,5] => [1,4,6,3,2,5] => [1,4,6,2,5,3] => 3
[[1,3,4],[2],[5],[6]] => [6,5,2,1,3,4] => [2,1,6,5,3,4] => [1,6,2,3,4,5] => 1
[[1,2,4],[3],[5],[6]] => [6,5,3,1,2,4] => [1,3,6,5,2,4] => [1,3,6,2,4,5] => 3
[[1,2,3],[4],[5],[6]] => [6,5,4,1,2,3] => [1,2,6,5,4,3] => [1,2,6,3,4,5] => 1
[[1,4],[2,5],[3,6]] => [3,6,2,5,1,4] => [3,2,1,6,5,4] => [1,6,2,3,4,5] => 1
[[1,3],[2,5],[4,6]] => [4,6,2,5,1,3] => [2,4,1,6,5,3] => [1,6,2,4,3,5] => 3
[[1,2],[3,5],[4,6]] => [4,6,3,5,1,2] => [1,4,3,6,5,2] => [1,4,2,3,6,5] => 2
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Description
The number of big ascents of a permutation.
For a permutation $\pi$, this is the number of indices $i$ such that $\pi(i+1)−\pi(i) > 1$.
For the number of small ascents, see St000441The number of successions of a permutation..
For a permutation $\pi$, this is the number of indices $i$ such that $\pi(i+1)−\pi(i) > 1$.
For the number of small ascents, see St000441The number of successions of a permutation..
Map
runsort
Description
The permutation obtained by sorting the increasing runs lexicographically.
Map
reading word permutation
Description
Return the permutation obtained by reading the entries of the tableau row by row, starting with the bottom-most row in English notation.
Map
Foata bijection
Description
Sends a permutation to its image under the Foata bijection.
The Foata bijection $\phi$ is a bijection on the set of words with no two equal letters. It can be defined by induction on the size of the word:
Given a word $w_1 w_2 ... w_n$, compute the image inductively by starting with $\phi(w_1) = w_1$.
At the $i$-th step, if $\phi(w_1 w_2 ... w_i) = v_1 v_2 ... v_i$, define $\phi(w_1 w_2 ... w_i w_{i+1})$ by placing $w_{i+1}$ on the end of the word $v_1 v_2 ... v_i$ and breaking the word up into blocks as follows.
To compute $\phi([1,4,2,5,3])$, the sequence of words is
This bijection sends the major index (St000004The major index of a permutation.) to the number of inversions (St000018The number of inversions of a permutation.).
The Foata bijection $\phi$ is a bijection on the set of words with no two equal letters. It can be defined by induction on the size of the word:
Given a word $w_1 w_2 ... w_n$, compute the image inductively by starting with $\phi(w_1) = w_1$.
At the $i$-th step, if $\phi(w_1 w_2 ... w_i) = v_1 v_2 ... v_i$, define $\phi(w_1 w_2 ... w_i w_{i+1})$ by placing $w_{i+1}$ on the end of the word $v_1 v_2 ... v_i$ and breaking the word up into blocks as follows.
- If $w_{i+1} \geq v_i$, place a vertical line to the right of each $v_k$ for which $w_{i+1} \geq v_k$.
- If $w_{i+1} < v_i$, place a vertical line to the right of each $v_k$ for which $w_{i+1} < v_k$.
To compute $\phi([1,4,2,5,3])$, the sequence of words is
- $1$
- $|1|4 \to 14$
- $|14|2 \to 412$
- $|4|1|2|5 \to 4125$
- $|4|125|3 \to 45123.$
This bijection sends the major index (St000004The major index of a permutation.) to the number of inversions (St000018The number of inversions of a permutation.).
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