1<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> 2 <mrow> 3 <msub> 4 <mi>I</mi> 5 <mi>x</mi> 6 </msub> 7 <mfenced> 8 <mrow> 9 <mi>a</mi> 10 <mo>,</mo> 11 <mi>a</mi> 12 <mo>+</mo> 13 <mi>β</mi> 14 </mrow> 15 </mfenced> 16 <mspace width="1em"/> 17 <mspace width="1em"/> 18 <mo>;</mo> 19 <mspace width="1em"/> 20 <mspace width="1em"/> 21 <mi>β</mi> 22 <mo><</mo> 23 <msqrt> 24 <mi>a</mi> 25 </msqrt> 26 </mrow> 27</math> 28 29