I am facing some difficulties proving the reverse operation on N elements. 

Let Σ be an alphabet, given a word x ∈ Σ∗ and rev(x) the reverse of x.
I want to prove that 

```
for n >= 1 and for  X1,X2,...,Xn ∈ Σ∗ 

rev (X1,X2,...,Xn) = rev(Xn),...,rev(X1)

```

I would appriciate your assistance.