# wallType -- get the type of a wall for a given quiver

## Synopsis

• Usage:
wallType (Qplus, Q)
• Inputs:
• Outputs:
• wall type is given by (ZZ, ZZ)

## Description

every wall can be represented uniquely by a partition of the vertices Q0 of Q into two sets Qplus and Qminus. We denote the wall W by the subset of vertices Qplus used for defining it.

The type of the wall is defined as (t+,t-) where t^+ is the number of arrows starting Qplus and ending in Qminus, and t- is the number of arrows starting Qminus and ending in Qplus.

 i1 : wallType({0,2,3}, bipartiteQuiver(2, 3)) o1 = (1, 2) o1 : Sequence

## Ways to use wallType :

• "wallType(List,ToricQuiver)"
• wallType(List,Matrix) (missing documentation)

## For the programmer

The object wallType is .