\xrightleftharpoons{abc}The command \xrightleftharpoons{abc} is used in LaTeX to create a pair of right and left harpoons with a label 'abc' above them. This is often used in chemical equations to denote reversible reactions or in mathematical contexts to indicate a bidirectional relationship.
Represents a reversible reaction between A and B with 'abc' as the label.
A \xrightleftharpoons{abc} BIndicates an equilibrium state between X and Y with 'equilibrium' as the label.
X \xrightleftharpoons{equilibrium} YShows a reversible process between P and Q with 'k' as the rate constant.
P \xrightleftharpoons{k} Q