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# 9.1 In-Line Mathematics

In-line mathematics is created using the math environment. (Note U.S. spelling -- “math” not “maths”).

Example:

The variable \begin{math}x\end{math} is transformed by the function \begin{math}f(x)\end{math}.

It's somewhat cumbersome having to type \begin{math} and \end{math} and it also makes the source code a little difficult to read so there are shorthand notations that can be used instead: $$is equivalent to \begin{math} and$$ is equivalent to \end{math}. So the example above can be rewritten:

The variable $$x$$ is transformed by the function $$f(x)$$.

There is an even shorter notation: The special character $is equivalent to both \begin{math} and \end{math}: The variable$x$is transformed by the function$f(x)$. This is considerably easier to type and to read, but you need to make sure that all your$ symbols have matching pairs. The above code will look like:

The other advantage in using $over $$and$$ is that$ is a robust command, whereas $$and$$ are fragile commands and will need to be protected if they occur in a moving argument.

Note: you should always make sure you are in maths mode to typeset any variables (such as , , ), as this will ensure that the correct maths fonts are used, as well as the appropriate spacing. Similarly, don't use $as a short cut for an italic font. Notice the$difference$between$(x', y', z')\$ and \textit{(x', y', z')}.

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