\leftleftarrowsThe \leftleftarrows command in LaTeX is used to display a pair of left-pointing arrows, one above the other. This symbol is often used in mathematical contexts to denote a relationship or transformation that involves two processes or mappings going in the same direction, typically to the left.
Indicates a transformation or mapping from B to A with function f.
A \xleftleftarrows{f} BRepresents a bidirectional relationship or equivalence between sets X and Y.
X \leftleftarrows YShows a sequence of transformations or relations from R to Q to P.
P \leftleftarrows Q \leftleftarrows R