mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced close="]" separators="|"><mrow><mo>-</mo><mi mathvariant="normal">∞</mi><mo>,</mo><mi mathvariant="normal"> </mi><mfrac><mn>1</mn><mn>3</mn></mfrac></mrow></mfenced></math>