Verify associativity for the following three mappings: f:N→Z0(the set of non-zero integers), g:g:Z0→Q and h:Q→R given by f(x)=2x, g(x)=1/x and h(x)=ex.

Verify associativity for the following three mappings: f: $N \to Z 0 (t h e s e t o f n o n - z e r o i n t e g e r s)$ , g: $g : Z 0 \to Q$ and $h : Q \to R$ given by f(x)=2x, g(x)=1/x and h(x)=ex.

Match the items on the right to the items on the left.