data/mathematical/266.mml
<math xmlns='http://www.w3.org/1998/Math/MathML' display='inline'><semantics><mrow><mo stretchy="false">{</mo><msup><mover><mi>ξ</mi><mo stretchy="false">→</mo></mover> <mi>μ</mi></msup><mo>,</mo><msup><mi>τ</mi> <mi>μ</mi></msup><mo stretchy="false">}</mo></mrow><annotation encoding='application/x-tex'>\{\vec{\xi}^{\mu},\tau^{\mu}\}</annotation></semantics></math>