# Link

A link is an assembly of knots with mutual entanglements.

Link is a graduate-level concept that would be first encountered in a topology course.

### Prerequisites

Knot: | A closed, nonself-intersecting curve that is embedded in three dimensions and that cannot be untangled to produce a simple loop. |

Topology: | (1) As a branch of mathematics, topology is the mathematical study of object's properties that are preserved through deformations, twistings, and stretchings. (2) As a set, a topology is a set along with a collection of subsets that satisfy several defining properties. |