Wolfram Research, Inc.
1.2.5 The Four Kinds of Bracketing in Mathematica
Over the course of the last few sections, we have introduced each of the four kinds of bracketing used in Mathematica. Each kind of bracketing has a very different meaning. It is important that you remember all of them.
The four kinds of bracketing in Mathematica.
When the expressions you type in are complicated, it is often a good idea to put extra space inside each set of brackets. This makes it somewhat easier for you to see matching pairs of brackets. v[[ a, b ]] is, for example, easier to recognize than v[[a, b]].