Latest news 2022-12-06: Ebook edition of The Foolish Hedgehog now available.

# B.11 Extra \right

There are a number of possible causes. The most probable is that you have a \right that doesn't have a matching \left. (Remember left comes before right.) Another possible cause is that you have missed out \end{array}. (Remember that environments provide implicit grouping, and \left and its matching \right must appear within the same group level.)

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