data/mathtoweb/224.mml
<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msup><mrow><mi mathvariant="bold">B</mi></mrow><mo>*</mo></msup><mstyle mathvariant="bold"><msub><mi>σ</mi><mn>3</mn></msub></mstyle><mi mathvariant="bold">B</mi><mo>=</mo><mstyle mathvariant="bold"><msub><mi>σ</mi><mn>3</mn></msub></mstyle></mrow></math>