Limit of a Function Method "Abstract: The demand function of the limit is a difficult point in higher mathematics, is one of the students must master the Function limit is a dollar limit of the function theory is the limit of the extension Limit is very important to master the Function of many types of limits, is also more complicated, method for evaluating flexible and various extreme right's demand this method are summarized, and Fenbie Fenxishuiming by Juti of