 These features are, in fact, characteristic for Dedekind’s works overall, including his studies in algebraic number theory and his foundational investigations. It is by taking them into account that calling his methodology, not just “general”  and “abstract”, but “structuralist” starts to acquire further content. It also helps us to recognized in which way Dedekind’s approach played a crucial role in the emergence of “modern” mathematics, as shaped by a structuralist methodology (cf. Reck &amp; Schiemer 2020). Looking back on the corresponding history of algebra, B.L. van der Waerden, himself a major contributor to this field, concluded: “It was Evariste Galois and Richard Dedekind who gave modern algebra its structure; that is where its weight-bearing skeleton comes from” (Dedekind 1964, foreword, quoted in Mehrtens 1979b; cf. also Gray 2008).