Answer by Frank Mittelbach for Does \\ in the last line of an array have any...
As @whlt3 said it is required if you intend to have a final horizontal line \hline or a partical line via \cline{...} or if you want to have some extra space blow that line produced via the optional...
View ArticleDoes \\ in the last line of an array have any effect?
Consider the following example:\begin{array}{l}line 1 \\line 2 \\\end{array}Is the \\ in the last line completely optional or are there circumstances under which it has any effect?
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