# How can I get a left bracket without a right bracket?

**How can I get a left bracket without a right bracket?**

Since brackets have a grouping function they must always match and be correctly nested.

To get a single bracket without a matching bracket partner you
have to escape the bracket with a backslash. For example to get a "["
without a corresponding "]" you should enter **\[**.

Thus to typeset the interval [3;8) you should enter **\[3 ";" 8\)**. The quotation marks around the semicolon ensures that it is not typeset in italic. (You're right, this has nothing to do with brackets!)

For scalable brackets it is essential that **left** and **right** matches, since the content that the brackets enclose must be well defined.

In this case you can use the invisible bracket **none** to get a single bracket. For example to get a scalable "["
without a corresponding "]" you should enter **left [... right none**.

Thus to typeset
you
should enter** x=left lbrace binom -5 3 right none**.