mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">F</mi><mo>(</mo><mover><mi mathvariant="normal">i</mi><mo>^</mo></mover><mo>-</mo><mover><mi mathvariant="normal">j</mi><mo>^</mo></mover><mo>)</mo></math>