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            <mi>∇</mi>
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   <mfenced close=")" open="(">
      <msub>
         <mi>α</mi>
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      <mi>…</mi>
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         <mi>X</mi>
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      <msub>
         <mi>X</mi>
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   <mo>=</mo>
   <mi>Y</mi>
   <mfenced close=")" open="(">
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         <mi>T</mi>
         <mfenced close=")" open="(">
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               <mi>α</mi>
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            <msub>
               <mi>α</mi>
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            <mi>…</mi>
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               <mi>X</mi>
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               <mi>X</mi>
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