ag-gipp/GoUldI

<math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced close="}" open="{"><msup><mover accent="true"><mi>ξ</mi><mo>→</mo></mover><mi>μ</mi></msup><msup><mi>τ</mi><mi>μ</mi></msup></mfenced></math>