is all "concepts, judgments, assumptions, deductive and inductive conclusions". In particular, for Jacoby species-generic relationships, i.e. relationships between more general facts, the genus, and more specific facts, the species, are determined by a certain type of identity and non-identity. Only this is relevant for logic.

Jacoby sees his understanding of logic and its field of objects, as well as his definition of identity, in stark contrast to modern formal logic, of which he also holds the opinion that it is connected to a certain