John T. Wodder II

icon location A well house for a large spring

Results 282 issues of John T. Wodder II

Add a `left_inversion_count()` method

enhancement

Add a method for decomposing into a collection of transpositions

Exactly which transpostions you get for a given permutation is unspecified.

enhancement

Add methods for iterating over `$S_n$` in (right) Lehmer code order

Add right Lehmer equivalents of `group()`, `next_permutation()`, and `prev_permutation()`.

enhancement

Add a method for generating the alternating group of a given degree

I.e., `$A_n$`. See

enhancement

Add a method for iterating over all finite permutations in ascending order of degree

Iterating in left Lehmer order should accomplish this.

enhancement

Add methods for converting from left/right inversion counts to permutations

enhancement

Add methods for testing whether a permutation does or does not permute a given integer or set of integers

enhancement

Add an `is_derangement()` method/property

enhancement

Add a method for getting a permutation's cycle type

enhancement

Make the errors raised by the constructor more informative

enhancement