The Four Kinds of Bracketing in the Wolfram Language
There are four kinds of bracketing used in the Wolfram Language. Each kind of bracketing has a very different meaning. It is important that you remember all of them.
| (term) | parentheses for grouping |
| f[x] | square brackets for functions |
| {a,b,c} | curly braces for lists |
| v[[i]] | double brackets for indexing (Part[v,i]) |
The four kinds of bracketing in the Wolfram Language.
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}]].