How to do indentation in Latex (Beginner question)

Question

How can I write the following in Latex:

We want to study: X -> Y            
                  x -> f(x)

Also if there is any Latex book that you recommend for me, I would like you if you suggest it.

Thank you.

Answer 1

Add this line to your preamble (if not already done):

\usepackage{amsmath} %% or, better, the mathtools extension)

and this line in the body of your document:

We want to study $\begin{aligned}[t]f\colon X & \longrightarrow Y\\ x&\longmapsto f(x) \end{aligned} $