<?xml version="1.0" encoding="UTF-8"?>
<math xmlns="http://www.w3.org/1998/Math/MathML">
   <msub>
      <mi>R</mi>
      <mi>a</mi>
   </msub>
   <mfenced close=")" open="(">
      <mrow>
         <mstyle mathvariant="bold">
            <mi>b</mi>
         </mstyle>
         <mstyle mathvariant="normal">
            <mo>;</mo>
         </mstyle>
         <mstyle mathvariant="bold">
            <mi>z</mi>
         </mstyle>
      </mrow>
   </mfenced>
   <msub>
      <mi>R</mi>
      <mrow>
         <mo>-</mo>
         <mi>a</mi>
      </mrow>
   </msub>
   <mfenced close=")" open="(">
      <mrow>
         <mstyle mathvariant="bold">
            <mi>b</mi>
         </mstyle>
         <mstyle mathvariant="normal">
            <mo>;</mo>
         </mstyle>
         <mstyle mathvariant="bold">
            <mi>z</mi>
         </mstyle>
      </mrow>
   </mfenced>
   <mo>&gt;</mo>
   <mn>1</mn>
</math>
