centerbaseline=false mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><mn>3</mn></mfrac><mo> </mo><menclose notation="bottom"><mo><</mo></menclose><mo> </mo><mi mathvariant="normal">x</mi><mo> </mo><menclose notation="bottom"><mo><</mo></menclose><mo> </mo><mn>1</mn></math>