# Schoute matrix

Schoute matrix |

The **Schoute matrices** are two infinite matrices, whose rows are periodic permutations of the non-negative integers.

These **Schoute permutations** are the result of applying finite permutations to the binary digits of the non-negative integers.

The order of the rows follows from the reverse colexicographic order of finite permutations.

The columns can be seen as partitions of the set of finite permutations, which shall be called **Schoute partitions**.

There appear to be no common names for these concepts. So here they have been named after Pieter Schoute, who probably first described the permutohedron.

The two versions shall be called **passive** and **active**.

The passive one shows the results of applying the respective bit-permutation. It is described by A195665.

The active one shows the permutations that produce these results. (A permutation is a bijective map. The result of applying it looks like its inverse.)

## factions of Boolean functions

[edit | edit source]These are three related factions of 4-ary Boolean functions. (See also Smallest Zhegalkin index#Factions.)

These binary matrices can be seen as passive Schoute matrices, where each integer is assigned a Boolean value.