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The limit of a sequence is the value that the terms of the sequence approach as the index goes to infinity. It is denoted as $\lim_{{n \to \infty}} a_n = L$.
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Convergence: A sequence is said to converge if it approaches some finite limit as the index goes to infinity.
Divergence: A sequence is said to diverge if it does not approach any finite limit as the index goes to infinity.
Squeeze Theorem: If $b_n \leq a_n \leq c_n$ and both $\lim_{{n \to \infty}} b_n = \lim_{{n \to \infty}} c_n = L$, then $\lim_{{n \to \infty}} a_n = L$.