Function coset

coset<T>(
struc: ChalkboardStructure<T>,
substruc: ChalkboardStructure<T>,
): ChalkboardSet<ChalkboardSet<T>>
Calculates the cosets of a subgroup or ideal with respect to a group or ring.
Type Parameters
- T
Parameters
- struc: ChalkboardStructure<T>
  The group or ring
- substruc: ChalkboardStructure<T>
  The subgroup or ideal
Returns ChalkboardSet<ChalkboardSet<T>>
Example
```
const Z4 = Chalkboard.abal.group(Chalkboard.abal.Z(4), (a, b) => (a + b) % 4, 0, (a) => (4 - a) % 4);
const H = Chalkboard.abal.group(Chalkboard.abal.set([0, 2]), (a, b) => (a + b) % 4, 0, (a) => a);
const cosets = Chalkboard.abal.coset(Z4, H); // Returns the cosets of {0, 2}
```
- Defined in Chalkboard.abal.ts:317