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isVexillary -- whether a permutation is vexillary

Synopsis

Description

A permutation $p$ is vexillary if it is $2143$-avoiding.

i1 : p = permutation {3,1,2,5,4}

o1 = Permutation{3, 1, 2, 5, 4}

o1 : Permutation
i2 : isVexillary p

o2 = false

See also

Ways to use isVexillary:

For the programmer

The object isVexillary is a method function.