mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle mathsize="12px"><mover><mi mathvariant="normal">B</mi><mo>→</mo></mover><mo> </mo><mo>×</mo><mo> </mo><mover><mi mathvariant="normal">C</mi><mo>→</mo></mover></mstyle></math>