data/mathoid/209.mml
<math
xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="ModifyingAbove left-parenthesis normal upper Delta upper H right-parenthesis squared With bar equals StartFraction 1 Over upper N EndFraction sigma-summation Underscript i equals 1 Overscript upper N Endscripts left-bracket mathematical left-angle psi Subscript i Baseline StartAbsoluteValue upper H Subscript i Superscript 2 Baseline EndAbsoluteValue psi Subscript i Baseline mathematical right-angle minus mathematical left-angle psi Subscript i Baseline StartAbsoluteValue upper H Subscript i Baseline EndAbsoluteValue psi Subscript i Baseline mathematical right-angle squared right-bracket">
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<mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="20" data-semantic-parent="21">N</mi>
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<mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="41" data-semantic-parent="42">i</mi>
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<mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="49" data-semantic-parent="50">i</mi>
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<annotation encoding="application/x-tex">{\overline {(\Delta H)^{2}}}={\frac {1}{N}}\sum _{i=1}^{N}[\langle \psi _{i}|H_{i}^{2}|\psi _{i}\rangle -\langle \psi _{i}|H_{i}|\psi _{i}\rangle ^{2}]</annotation>
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</math>