\lgroup \rgroup\lgroup and \rgroup are used to create left and right group delimiters, respectively. These delimiters are often used in mathematical expressions to group terms or expressions together, similar to parentheses, but with a different visual style. They are particularly useful in matrix notation or when denoting sets or tuples in a more stylized manner.
A stylized grouping of elements a and b, similar to a tuple.
\lgroup a, b \rgroupA matrix enclosed in group delimiters.
\lgroup \begin{matrix} a & b \\ c & d \end{matrix} \rgroupAn expression enclosed in group delimiters, raised to a power.
\lgroup x + y \rgroup^2