data/mathtoweb/197.mml
<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>A</mi><mo>≡</mo><mi>A</mi><mrow><mo form="prefix">(</mo><mi>τ</mi><mo form="postfix">)</mo></mrow><mo>=</mo><mfrac linethickness="1"><mn>1</mn><mrow><msub><mi>θ</mi><mn>4</mn></msub><mrow><mo rspace="0.3em" lspace="0em" stretchy="true" fence="true" form="prefix">(</mo><mn>0</mn><mo>|</mo><mn>2</mn><mi>τ</mi><mo rspace="0em" lspace="0.3em" stretchy="true" fence="true" form="postfix">)</mo></mrow></mrow></mfrac></mrow></math>