“…His approach to concepts (for instance, in “On Concept and Object,” Frege, 1892) clearly follows a rationalist approach and was a big influence in Dahlberg’s logic. In this vein, Dahlberg gave the following definition of concept that has been consistent in time: “A concept is a knowledge unit, comprising verifiable statements about a selected item of reference, represented in a verbal form” (Dahlberg, 1978, p. 143); “A concept is a unit of knowledge that is made by making substantial and verifiable statements about a reference object that summarize them in a short and descriptive denomination (name or code) for the purpose of communicability” (Dahlberg, 2014, 37ff cited in English translation in Ohly, 2018).…”