A rigorous, axiomatically formulated presentation of the 'zero-square', or 'nilpotent' infinitesimal.

Introducing calculus at the basic level, this text covers hyperreal numbers and hyperreal line, continuous functions, integral and differential calculus, fundam

This truly elementary book on categories introduces retracts, graphs, and adjoints to students and scientists.

A coherent, self-contained treatment of the central topics of real analysis employing modern infinitesimals.