BraidIsPositive

Whether every letter in a braid's word is positive — no generator appears inverted.

BraidIsPositive(braid)whether every letter of the word is positive

Typed signatures

Type	Package	Applies
(expression<Braid> | string) -> boolean	braid	always

Domain: Braids and knots

Examples

Basic #

live ↗

In$\mathrm{BraidIsPositive}(\mathrm{Braid}(3, \bigl\lbrack1, 2, 1\bigr\rbrack))$Out$\mathrm{True}$

live ↗

In$\mathrm{BraidIsPositive}(\mathrm{Braid}(3, \bigl\lbrack1, -2\bigr\rbrack))$Out$\mathrm{False}$

About

Examples	2

See also: SeifertGenus, TorusBraid