摘 要: | The main results of the present paper are:1. It is rational to define the limit by the infinitesimal method.2. We have proved that the definitions of the limit by the infinitesimal argument and by the ε-δ arguement are quite equivalent.3. It is possible to determine the values of infinite divergent integrals.Example 1.Example 2. From the following equalities we can calculate the classical electron radius η=2.818×10~(-13) cm.(c, light velocity)
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