centerbaseline=false
mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mrow><mfenced separators="|"><mrow><msub><mi mathvariant="normal">A</mi><mn>2</mn></msub><mo>&#215;</mo><msub><mi mathvariant="normal">T</mi><mn>1</mn></msub></mrow></mfenced><mo>-</mo><mfenced separators="|"><mrow><msub><mi mathvariant="normal">A</mi><mn>1</mn></msub><mo>&#215;</mo><msub><mi mathvariant="normal">T</mi><mn>2</mn></msub></mrow></mfenced></mrow><mrow><msub><mi mathvariant="normal">T</mi><mn>1</mn></msub><mo>-</mo><msub><mi mathvariant="normal">T</mi><mn>2</mn></msub></mrow></mfrac></math>