Abstract
The basic ideas of the renormalization-group (RG) method are presented. In particular, the concept of renormalization invariance, the results of which are the functional and differential RG equations is explained. Ways of solving the RG differential equation, as well as some technical aspects of the RG method, such as the method of ϵ-expansion, are outlined. The examples presented, which relate to the analysis of various mechanical problems, serve to illustrate the RG method and should promote its better understanding.
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