Polycarbonate Diols (PCD) are used for a wide range of polyurethane-based coating formulations, providing an extreme durability and a high performance to the final polymer. ok
In mathematics, a reciprocity law is a generalization of the law of quadratic reciprocity. There are several different ways to express reciprocity laws.
A very deep and persistent line of philosophical discussion explores the way in which reciprocity can resolve conflicts between justice and self-interest, and can justify the imposition (or limitation) of social, political, and legal obligations that require individuals to sacrifice their own interests.