<!DOCTYPE html>
<html>
<head>
  <title>op-dict lspace and rspace</title>
  <link rel="mismatch" href="op-dict-9-notref.html">
</head>
<body>
  <math>
    <mrow>
      <mi>x</mi><mo form="prefix">&#x2202;</mo><mi>y</mi>
    </mrow>
  </math>
</body>
</html>
