\xleftarrow{abc}The \xleftarrow{abc} command in LaTeX is used to create an extensible left arrow with a label above it. This is particularly useful in mathematical expressions where you want to denote a transformation, mapping, or any other relation with a descriptive label. The label can be any text or mathematical expression, and the arrow will adjust its size to accommodate the label.
Indicates a transformation or mapping from B to A with the label 'abc'.
A \xleftarrow{abc} BRepresents a function or operation from Y to X with the function 'f(x)' as the label.
X \xleftarrow{f(x)} YShows an operation or process from N to M with the word 'operation' as the label.
M \xleftarrow{\text{operation}} N