ag-gipp/GoUldI

<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>F</mi><mfenced close=")" open="("><mn>1</mn><mrow><mi>a</mi><mo>;</mo><mi>a</mi><mo>+</mo><mn>1</mn><mo>;</mo><mo>-</mo><mn>1</mn></mrow></mfenced><mo>=</mo><mrow><mn>1</mn></mrow><mrow><mn>2</mn></mrow><mi>a</mi><mfenced close=")" open="("><mrow><mi>ψ</mi><mfenced close=")" open="("><mrow><mrow><mn>1</mn></mrow><mrow><mn>2</mn></mrow><mi>a</mi><mo>+</mo><mrow><mn>1</mn></mrow><mrow><mn>2</mn></mrow></mrow></mfenced><mo>-</mo><mi>ψ</mi><mfenced close=")" open="("><mrow><mrow><mn>1</mn></mrow><mrow><mn>2</mn></mrow><mi>a</mi></mrow></mfenced></mrow></mfenced></math>