array

 \begin{array}{col1col2...coln}
 column 1 entry & column 2 entry ... & column n entry \\
 .
 .
 .
 \end{array}

Math arrays are produced with the array environment. It has a single mandatory argument describing the number of columns and the alignment within them. Each column, coln, is specified by a single letter that tells how items in that row should be formatted.

c for centered
l for flushleft
r for flushright

Column entries must be separated by an &. Column entries may include other LaTeX commands. Each row of the array must be terminated with the string \\.