# Infinity minus infinity

Calculus Level 2

$\displaystyle{ S }_{ N }=\sum _{k=1}^{N}\frac1k$

Let $$S_N$$ satisfy the equation above. What is the value of $$\displaystyle \lim _{ n\rightarrow \infty }{ \left( { S }_{ 2n }-{ S }_{ n } \right) }$$?