The discussion revolves around deriving the equation Cp - Cv = T(dP/dT)v * (dV/dT)p in thermodynamics, with participants seeking clarification on the variables involved and the equations needed for the derivation. The original poster indicates that this is an assignment given by their lecturer without sufficient details. There is a request for more information on how to express changes in internal energy (dU) in terms of entropy (dS) and volume (dV), as well as how to represent entropy as a function of temperature and pressure. The conversation emphasizes the need for a clearer understanding of the underlying concepts and equations to successfully complete the assignment. Overall, the thread highlights the challenges students face when tackling complex thermodynamic equations without adequate guidance.