Infinitesimals via Cauchy sequences: Refining the classical equivalence

Abstract

A refinement of the classic equivalence relation among Cauchy sequences yields a useful infinitesimal-enriched number system. Such an approach can be seen as formalizing Cauchy's sentiment that a null sequence "becomes" an infinitesimal. We signal a little-noticed construction of a system with infinitesimals in a 1910 publication by Giuseppe Peano, reversing his earlier endorsement of Cantor's belittling of infinitesimals.

8 pages, to appear in Open Mathematics

References in corpus (3)

• Procedures of Leibnizian infinitesimal calculus: An account in three modern frameworks
• Toward a history of mathematics focused on procedures
• Continuity between Cauchy and Bolzano: Issues of antecedents and priority