In this dissertation we study the \textit{polymer expansion technique}, which plays a fundamental role in rigorous statistical mechanics, in the study of phase transitions in physical systems. We discuss the pressure ...

The free energy market is an environment in which consumers can freely choose their own energy suppliers, but it is limited to large consumers. As the society becomes more interested in this kind of hiring, the government ...

Based on historiography, this work aimed to construct an interpretation of the period of transition from slave to free labor, especially on the equation between economic expansion and labor supply. The result of this allowed ...