\underleftrightarrow{AB}The command \underleftrightarrow{AB} is used in LaTeX to place a double-headed arrow underneath the text 'AB'. This is often used in mathematical contexts to denote a relation or correspondence between two points or elements, emphasizing a bidirectional relationship.
Denotes a bidirectional relationship between points A and B.
\underleftrightarrow{AB}Illustrates the symmetry in bidirectional relationships.
\underleftrightarrow{XY} = \underleftrightarrow{YX}Describes a vector or line segment with directionality between points P and Q.
\text{The vector } \underleftrightarrow{PQ} \text{ represents a line segment with directionality.}