ag-gipp/GoUldI

<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>A</mi><mi>k</mi></msub><mfenced close=")" open="("><mi>n</mi></mfenced><mo>=</mo><msub><mo>∑</mo><mrow><mn>1</mn><mo>&lt;</mo><mi>h</mi><mo>≤</mo><mi>k</mi><mfenced close=")" open="("><mi>h</mi><mi>k</mi></mfenced><mo>=</mo><mn>1</mn></mrow></msub><mrow><mstyle mathvariant="normal"><msup><mi>e</mi><mrow><mi>π</mi><mstyle mathvariant="normal"><mi>i</mi></mstyle><mstyle mathvariant="normal"><mi>f</mi><mfenced close=")" open="("><mi>h</mi><mi>k</mi></mfenced><mo>-</mo><mfenced close=")" open="("><mrow><mn>2</mn><mi>π</mi><mstyle mathvariant="normal"><mi>i</mi></mstyle><mstyle mathvariant="normal"><mi>n</mi><mi>h</mi><mo>/</mo><mi>k</mi></mstyle></mrow></mfenced></mstyle></mrow></msup></mstyle></mrow></math>