Antihomomorphism of groups

Definition
Let $$G$$ and $$H$$ be groups. An antihomomorphism from $$G$$ to $$H$$ is a map $$f:G \to H$$ such that for any $$a,b \in G$$:

$$f(ab) = f(b)f(a)$$

Weaker properties

 * Semihomomorphism of groups
 * Quasihomomorphism of groups
 * 1-homomorphism of groups