Methods of Limit Proving by Using the Definition of Limit

Limit is one of the most important concepts in calculus.Concepts such as differential calculus,integral calculus and progression,are all defined by limit.So,its rather necessary to master a few methods of proving some limit problems. By analyzing the characteristics of limit proving by using the definition of limit, five methods to prove limit,amplifying,multiplying,adopting,squeezing and disproving were concluded.