Identifier
-
Mp00317:
Integer partitions
—odd parts⟶
Binary words
Mp00105: Binary words —complement⟶ Binary words
Mp00135: Binary words —rotate front-to-back⟶ Binary words
St001491: Binary words ⟶ ℤ
Values
[2] => 0 => 1 => 1 => 1
[2,1] => 01 => 10 => 01 => 1
[4] => 0 => 1 => 1 => 1
[2,2] => 00 => 11 => 11 => 2
[2,1,1] => 011 => 100 => 001 => 1
[4,1] => 01 => 10 => 01 => 1
[3,2] => 10 => 01 => 10 => 1
[2,2,1] => 001 => 110 => 101 => 2
[2,1,1,1] => 0111 => 1000 => 0001 => 1
[6] => 0 => 1 => 1 => 1
[4,2] => 00 => 11 => 11 => 2
[4,1,1] => 011 => 100 => 001 => 1
[3,2,1] => 101 => 010 => 100 => 1
[2,2,2] => 000 => 111 => 111 => 3
[2,2,1,1] => 0011 => 1100 => 1001 => 2
[6,1] => 01 => 10 => 01 => 1
[5,2] => 10 => 01 => 10 => 1
[4,3] => 01 => 10 => 01 => 1
[4,2,1] => 001 => 110 => 101 => 2
[4,1,1,1] => 0111 => 1000 => 0001 => 1
[3,2,2] => 100 => 011 => 110 => 1
[3,2,1,1] => 1011 => 0100 => 1000 => 1
[2,2,2,1] => 0001 => 1110 => 1101 => 2
[8] => 0 => 1 => 1 => 1
[6,2] => 00 => 11 => 11 => 2
[6,1,1] => 011 => 100 => 001 => 1
[5,2,1] => 101 => 010 => 100 => 1
[4,4] => 00 => 11 => 11 => 2
[4,3,1] => 011 => 100 => 001 => 1
[4,2,2] => 000 => 111 => 111 => 3
[4,2,1,1] => 0011 => 1100 => 1001 => 2
[3,3,2] => 110 => 001 => 010 => 1
[3,2,2,1] => 1001 => 0110 => 1100 => 1
[2,2,2,2] => 0000 => 1111 => 1111 => 4
[8,1] => 01 => 10 => 01 => 1
[7,2] => 10 => 01 => 10 => 1
[6,3] => 01 => 10 => 01 => 1
[6,2,1] => 001 => 110 => 101 => 2
[6,1,1,1] => 0111 => 1000 => 0001 => 1
[5,4] => 10 => 01 => 10 => 1
[5,2,2] => 100 => 011 => 110 => 1
[5,2,1,1] => 1011 => 0100 => 1000 => 1
[4,4,1] => 001 => 110 => 101 => 2
[4,3,2] => 010 => 101 => 011 => 1
[4,3,1,1] => 0111 => 1000 => 0001 => 1
[4,2,2,1] => 0001 => 1110 => 1101 => 2
[3,3,2,1] => 1101 => 0010 => 0100 => 1
[3,2,2,2] => 1000 => 0111 => 1110 => 2
[10] => 0 => 1 => 1 => 1
[8,2] => 00 => 11 => 11 => 2
[8,1,1] => 011 => 100 => 001 => 1
[7,2,1] => 101 => 010 => 100 => 1
[6,4] => 00 => 11 => 11 => 2
[6,3,1] => 011 => 100 => 001 => 1
[6,2,2] => 000 => 111 => 111 => 3
[6,2,1,1] => 0011 => 1100 => 1001 => 2
[5,4,1] => 101 => 010 => 100 => 1
[5,3,2] => 110 => 001 => 010 => 1
[5,2,2,1] => 1001 => 0110 => 1100 => 1
[4,4,2] => 000 => 111 => 111 => 3
[4,4,1,1] => 0011 => 1100 => 1001 => 2
[4,3,3] => 011 => 100 => 001 => 1
[4,3,2,1] => 0101 => 1010 => 0101 => 0
[4,2,2,2] => 0000 => 1111 => 1111 => 4
[3,3,2,2] => 1100 => 0011 => 0110 => 2
[10,1] => 01 => 10 => 01 => 1
[9,2] => 10 => 01 => 10 => 1
[8,3] => 01 => 10 => 01 => 1
[8,2,1] => 001 => 110 => 101 => 2
[8,1,1,1] => 0111 => 1000 => 0001 => 1
[7,4] => 10 => 01 => 10 => 1
[7,2,2] => 100 => 011 => 110 => 1
[7,2,1,1] => 1011 => 0100 => 1000 => 1
[6,5] => 01 => 10 => 01 => 1
[6,4,1] => 001 => 110 => 101 => 2
[6,3,2] => 010 => 101 => 011 => 1
[6,3,1,1] => 0111 => 1000 => 0001 => 1
[6,2,2,1] => 0001 => 1110 => 1101 => 2
[5,4,2] => 100 => 011 => 110 => 1
[5,4,1,1] => 1011 => 0100 => 1000 => 1
[5,3,2,1] => 1101 => 0010 => 0100 => 1
[5,2,2,2] => 1000 => 0111 => 1110 => 2
[4,4,3] => 001 => 110 => 101 => 2
[4,4,2,1] => 0001 => 1110 => 1101 => 2
[4,3,3,1] => 0111 => 1000 => 0001 => 1
[4,3,2,2] => 0100 => 1011 => 0111 => 2
[3,3,3,2] => 1110 => 0001 => 0010 => 1
[12] => 0 => 1 => 1 => 1
[10,2] => 00 => 11 => 11 => 2
[10,1,1] => 011 => 100 => 001 => 1
[9,2,1] => 101 => 010 => 100 => 1
[8,4] => 00 => 11 => 11 => 2
[8,3,1] => 011 => 100 => 001 => 1
[8,2,2] => 000 => 111 => 111 => 3
[8,2,1,1] => 0011 => 1100 => 1001 => 2
[7,4,1] => 101 => 010 => 100 => 1
[7,3,2] => 110 => 001 => 010 => 1
[7,2,2,1] => 1001 => 0110 => 1100 => 1
[6,6] => 00 => 11 => 11 => 2
[6,5,1] => 011 => 100 => 001 => 1
[6,4,2] => 000 => 111 => 111 => 3
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Description
The number of indecomposable projective-injective modules in the algebra corresponding to a subset.
Let $A_n=K[x]/(x^n)$.
We associate to a nonempty subset S of an (n-1)-set the module $M_S$, which is the direct sum of $A_n$-modules with indecomposable non-projective direct summands of dimension $i$ when $i$ is in $S$ (note that such modules have vector space dimension at most n-1). Then the corresponding algebra associated to S is the stable endomorphism ring of $M_S$. We decode the subset as a binary word so that for example the subset $S=\{1,3 \} $ of $\{1,2,3 \}$ is decoded as 101.
Let $A_n=K[x]/(x^n)$.
We associate to a nonempty subset S of an (n-1)-set the module $M_S$, which is the direct sum of $A_n$-modules with indecomposable non-projective direct summands of dimension $i$ when $i$ is in $S$ (note that such modules have vector space dimension at most n-1). Then the corresponding algebra associated to S is the stable endomorphism ring of $M_S$. We decode the subset as a binary word so that for example the subset $S=\{1,3 \} $ of $\{1,2,3 \}$ is decoded as 101.
Map
odd parts
Description
Return the binary word indicating which parts of the partition are odd.
Map
rotate front-to-back
Description
The rotation of a binary word, first letter last.
This is the word obtained by moving the first letter to the end.
This is the word obtained by moving the first letter to the end.
Map
complement
Description
Send a binary word to the word obtained by interchanging the two letters.
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