die alternierende harmonische Folge <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle a_{n}=(-1)^{n+1}\cdot {\tfrac {1}{n}}}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><msub><mi>a</mi><mrow class="MJX-TeXAtom-ORD"><mi>n</mi></mrow></msub><mo>=</mo><mo stretchy="false">(</mo><mo>−<!-- − --></mo><mn>1</mn><msup><mo stretchy="false">)</mo><mrow class="MJX-TeXAtom-ORD"><mi>n</mi><mo>+</mo><mn>1</mn></mrow></msup><mo>⋅<!-- ⋅ --></mo><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="false" scriptlevel="0"><mfrac><mn>1</mn><mi>n</mi></mfrac></mstyle></mrow></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle a_{n}=(-1)^{n+1}\cdot {\tfrac {1}{n}}}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/eebf936d0bb7c8e4ebb123999ec5b50397b80b29" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -1.005ex; width:17.147ex; height:3.343ex;" alt="{\displaystyle a_{n}=(-1)^{n+1}\cdot {\tfrac {1}{n}}}"></span>
<a rel="nofollow" class="external text" href="http://kulla.me/">Stephan Kulla</a> (<a href="//commons.wikimedia.org/wiki/User:Stephan_Kulla" title="User:Stephan Kulla">Stephan Kulla</a>)
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