## Multivariable Calculus, 7th Edition

It means that the sum of an infinite series $\Sigma^{\infty}_{n=1}a_{n}=a_{1} + a_{2} + a_{3}...$ is $5$.
$\Sigma^{\infty}_{n=1}a_{n} = 5$ It means that the sum of an infinite series $\Sigma^{\infty}_{n=1}a_{n}=a_{1} + a_{2} + a_{3}...$ is $5$. So $\lim\limits_{n \to \infty}S_{n}=5$ where $S_{n}$ is partial sum.