ag-gipp/GoUldI

<math xmlns='http://www.w3.org/1998/Math/MathML' display='inline'><semantics><mrow><msubsup><mo>∑</mo> <mrow><mi>n</mi><mo>=</mo><mn>1</mn></mrow> <mn>∞</mn></msubsup><mi>f</mi><mo stretchy="false">(</mo><mi>n</mi><mo stretchy="false">)</mo><mo>=</mo><msub><mo>∏</mo> <mi>p</mi></msub><mo stretchy="false">(</mo><mn>1</mn><mo>−</mo><mi>f</mi><mo stretchy="false">(</mo><mi>p</mi><mo stretchy="false">)</mo><msup><mo stretchy="false">)</mo> <mrow><mo lspace="verythinmathspace" rspace="0em">−</mo><mn>1</mn></mrow></msup></mrow><annotation encoding='application/x-tex'>\sum_{n=1}^{\infty}f(n)=\prod_{p}(1-f(p))^{-1}</annotation></semantics></math>