Function endomorphism

endomorphism<T>(
struc: ChalkboardStructure<T>,
mapping: (element: T) => T,
): ChalkboardMorphism<T, T>
Defines an endomorphism of an algebraic structure.
Type Parameters
- T
Parameters
- struc: ChalkboardStructure<T>
  The algebraic structure which is both the domain and codomain of the morphism
- mapping: (element: T) => T
  The function that takes an element from the structure and maps it to another element in the same structure
Returns ChalkboardMorphism<T, T>
Example
```
const Z4 = Chalkboard.abal.group(Chalkboard.abal.Z(4), (a, b) => (a + b) % 4, 0, (a) => (4 - a) % 4);
const double = Chalkboard.abal.endomorphism(Z4, (x) => (2 * x) % 4); // Defines x ↦ 2x
```
- Defined in Chalkboard.abal.ts:492