ABSTRACT
Since its inception, phenomenology has grown so rich that today almost anyone can search out something from phenomenology's virgin forest without being unfaithful to or literally betraying phenomenology. For Husserl, after a period of great discoveries in mathematics and their utilization, it is now time to inquire into the nature of its basic concepts. The real impulse for Husserl's philosophizing, that which sets it in motion, is the inquiry into these basic concepts: more precisely, into "number," the basic concept of arithmetic. Husserl summarizes: "An aggregate arises when a unified interest, and within and along with it at the same time a unified taking notice, brings into relief and includes certain contents for itself". In the Logical Investigations Husserl was concerned with the constitution of ideal objects.
