ag-gipp/GoUldI

<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>F</mi><mrow><mo rspace="0.3em" lspace="0em" stretchy="true" fence="true" form="prefix">(</mo><mn>1</mn><mo>,</mo><mi>a</mi><mo>;</mo><mi>a</mi><mo>+</mo><mn>1</mn><mo>;</mo><mo>-</mo><mn>1</mn><mo rspace="0em" lspace="0.3em" stretchy="true" fence="true" form="postfix">)</mo></mrow><mo>=</mo><mstyle scriptlevel="0" displaystyle="false"><mrow><mfrac linethickness="1"><mn>1</mn><mn>2</mn></mfrac></mrow></mstyle><mi>a</mi><mrow><mo rspace="0.3em" lspace="0em" stretchy="true" fence="true" form="prefix">(</mo><mi>&#x003C8;</mi><mo rspace="0.3em" lspace="0em" stretchy="true" fence="true" form="prefix">(</mo><mstyle scriptlevel="0" displaystyle="false"><mrow><mfrac linethickness="1"><mn>1</mn><mn>2</mn></mfrac></mrow></mstyle><mi>a</mi><mo>+</mo><mstyle scriptlevel="0" displaystyle="false"><mrow><mfrac linethickness="1"><mn>1</mn><mn>2</mn></mfrac></mrow></mstyle><mo rspace="0em" lspace="0.3em" stretchy="true" fence="true" form="postfix">)</mo><mo>-</mo><mi>&#x003C8;</mi><mo rspace="0.3em" lspace="0em" stretchy="true" fence="true" form="prefix">(</mo><mstyle scriptlevel="0" displaystyle="false"><mrow><mfrac linethickness="1"><mn>1</mn><mn>2</mn></mfrac></mrow></mstyle><mi>a</mi><mo rspace="0em" lspace="0.3em" stretchy="true" fence="true" form="postfix">)</mo><mo rspace="0em" lspace="0.3em" stretchy="true" fence="true" form="postfix">)</mo></mrow></mrow></math>