The Harmonic Series and the nth Term Test for Divergence
classification
🧮 math.HO
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seriesdivergenceharmonicapplyclassicalcomparisondirectidea
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The divergence of the harmonic series is proved by direct comparison with a series whose nth partial sum telescopes to the natural logarithm of n. The key idea is to apply the classical inequality x>=log(1+x) (valid for x>-1) with x=1/k and sum over k, 1<=k<=n-1.
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