\xleftharpoonup{abc}The command \xleftharpoonup{abc} is used to create an extensible arrow with a left harpoon above the text 'abc'. This is typically used in mathematical expressions to denote a specific type of mapping or transformation, often in the context of vector spaces or functions.
Denotes a vector with a left harpoon, often used to indicate a specific direction or transformation.
\xleftharpoonup{v}Represents a function with a left harpoon, indicating a transformation or mapping.
\xleftharpoonup{f(x)}Used to denote a variable or parameter with a left harpoon, suggesting a specific operation or relation.
\xleftharpoonup{\alpha}