centerbaseline=false
mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mfenced><mrow><msup><mi mathvariant="normal">p</mi><mn>2</mn></msup><mo>+</mo><mn>1</mn></mrow></mfenced><mrow><mn>2</mn><mi mathvariant="normal">p</mi></mrow></mfrac></math>