Angeordneter Körper/Kehrwerte/Abschätzung/Aufgabe

Es sei ${}K$ ein angeordneter Körper und seien ${}a>b>0$ Elemente aus ${}K$ . Zeige

{}{\frac {1}{a-b}}+{\frac {1}{a+b}}\geq {\frac {2}{a}}\,.

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