 As a third spin-off, Dedekind’s number-theoretic investigations led to the introduction of the notion of a “lattice” (under the name “Dualgruppe”). He examined that notion further, also as a topic in itself, in two relatively late articles: “Über Zerlegungen von Zahlen durch ihre größten gemeinsamen Teiler” (1897) and “Über die von drei Moduln erzeugte Dualgruppe” (1900). While these articles did not have the same immediate and strong impact that several of his other publications had, they were later recognized as original, systematic contributions to lattice theory, especially to the study of modular lattices (Mehrtens 1979a, ch. 2, Burris 1983, Alten et al. 2003, ch. 10) and to an axiomatic approach to mathematics more generally (Schlimm 2000, 2011, 2017).