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B.22 Missing delimiter

You have forgotten to specify the type of delimiter you want (for example, ( ) [ ] \{ \}). (Remember to use a . if you want an invisible delimiter, and remember that if you want a curly brace, you must have a backslash followed by the curly brace.)

Example:

This error will occur if you do, say,

✘ f(x) = \left{ \begin{array}{ll} 0 & x \leq 0\\ 1 & x > 1 \end{array} \right.

instead of

✔ f(x) = \left\{ \begin{array}{ll} 0 & x \leq 0\\ 1 & x > 1 \end{array} \right.

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