Q: Prove 1+1/2+1/3+...+1/(n-1) = lnn+c+o(n)

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Is there a way to prove $$1+\frac{1}{2}+\frac {1}{3}+...+\frac{1}{n-1} = \ln(n)+c+o(n)$$ where c is a constant? Any idea will be appreciated, thanks!