ion partial-differential Over partial-differential t EndFraction normal upper Psi left-parenthesis bold r comma t right-parenthesis equals left-bracket StartFraction minus italic h over two pi squared Over 2 mu EndFraction nabla squared plus upper V left-parenthesis bold r comma t right-parenthesis right-bracket normal upper Psi left-parenthesis bold r comma t right-parenthesis">
  <mi>i</mi>
  <mi class="MJX-variant">ℏ</mi>
  <mfrac>
    <mi mathvariant="normal">∂</mi>
    <mrow>
      <mi mathvariant=