Core traits and functionalities for the feos project.

The crate makes use of generalized (hyper-) dual numbers to generically calculate exact partial derivatives from Helmholtz energy equations of state. The derivatives are used to calculate

• properties,
• critical points,
• and phase equilibria.

In addition to that, utilities are provided to assist in the handling of parameters for both molecular equations of state and (homosegmented) group contribution methods. Mainly as a simple test case, a cubic equation of state is published as part of this crate. Implementations of more sophisticated models can be found in the feos crate.