Function isClosed

isClosed<T>(set: ChalkboardSet<T>, operation: (a: T, b: T) => T): boolean
Checks if a set is closed under an operation.
Type Parameters
- T
Parameters
- set: ChalkboardSet<T>
  The set
- operation: (a: T, b: T) => T
  The operation
Returns boolean
Example
```
const residues = Chalkboard.abal.Z(5);
const valid = Chalkboard.abal.isClosed(residues, (a, b) => (a + b) % 5); // Returns true
```
- Defined in Chalkboard.abal.ts:807