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[English translation of the fourth chapter of Ernst Schröder’s Lehrbuch der Arithmetik und Algebra für Lehrer und Studirende. In the first half of the chapter, Schröder lets his universally quantified variables range over the positive whole numbers and assigns his seven operations the properties they normally possess in this domain. He then identifies various conditions under which expressions featuring two or more operation-symbols are to be equated. He also offers a meticulous analysis of conventions governing the omission of parentheses. The second half of the chapter, is a contribution to formal algebra in which Schröder “investigates the laws of algebraic operations that apply to entirely general numbers in an unbounded domain making no further assumptions about their nature.” His main goal is to determine what follows from what: to distinguish “assumptions or premises as clearly as possible and investigate what each of them entails.” He further develops his class-algebra by allowing his operations to have classes as both inputs and outputs.]
Published: Apr 24, 2022
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