mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">V</mi><mfenced separators="|"><mrow><mfrac><mn>1</mn><mi mathvariant="normal">h</mi></mfrac><mo>+</mo><mfrac><mn>1</mn><mi mathvariant="normal">r</mi></mfrac></mrow></mfenced><mo>:</mo><mi mathvariant="normal">S</mi></math>