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In this didactic paper basic concepts of seismic isolation are discussed. Models and devices of isolating structures to mitigate seismic actions are presented. As an application an easy example is illustrated in the case of a single degree of freedom (SDOF) structure, showing as basic knowledges of mathematics are fundamental to formulate and solve problems in different fields of applied sciences, as seismic engineering. The aim of this paper is to give a simple lecture on techniques used to prevent the effects of an earthquake in a country.