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Latest news 2019-11-04: The giveaway of two signed copies of “Quack, quack, quack. Give my hat back!” has closed and the winning entrants have been selected. Thank you to everyone who took part.

B.8 Display math should end with $$

You may have a dollar sign ($) in a displayed maths environment, such as the equation environment. Remember that $ is short hand for \begin{math} or \end{math}, so you can't end one of the other environments with a $. (This error message is in fact a bit confusing, as it seems to be suggesting that you end a displayed maths environment with $$ which you also shouldn't do[Why use \[...\] in place of $$...$$].)


This book is also available as A4 PDF or 12.8cm x 9.6cm PDF or paperback (ISBN 978-1-909440-00-5).

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