A magma homomorphism between two magmas $M$ and $N$ is a function $f:M\to N$ such that for all $a$, $b\in M$,
\[f(ab) = f(a)f(b).\]
A magma homomorphism between two magmas $M$ and $N$ is a function $f:M\to N$ such that for all $a$, $b\in M$,
\[f(ab) = f(a)f(b).\]