Topoi: The Categorial Analysis of Logic (ISSN) 2nd Edition by R. Goldblatt (PDF)

Description

The first of its kind, this book presents a widely accessible exposition of topos theory, aimed at the philosopher-logician as well as the mathematician. It is suitable for individual study or use in class at the graduate level (it includes 500 exercises). It begins with a fully motivated introduction to category theory itself, moving always from the particular example to the abstract concept. It then introduces the notion of elementary topos, with a wide range of examples and goes on to develop its theory in depth, and to elicit in detail its relationship to Kripke’s intuitionistic semantics, models of classical set theory and the conceptual framework of sheaf theory (“localization” of truth). Of particular interest is a Dedekind-cuts style construction of number systems in topoi, leading to a model of the intuitionistic continuum in which a “Dedekind-real” becomes represented as a “continuously-variable classical real number”.The second edition contains a new chapter, entitled Logical Geometry, which introduces the reader to the theory of geometric morphisms of Grothendieck topoi, and its model-theoretic rendering by Makkai and Reyes. The aim of this chapter is to explain why Deligne’s theorem about the existence of points of coherent topoi is equivalent to the classical Completeness theorem for “geometric” first-order formulae.

User’s Reviews

Reviews from Amazon users which were colected at the time this book was published on the website:

⭐When Goldblatt’s book first hit the stands, it was blasted by reviewers who had a geometric predilection. They claimed that Goldblatt had trivialized this essentially rich geometric subject by giving a set-theoretic treatment.I became fascinated with topos theory in the summer of 1989. My only experience with category theory at that time was some dabbling that every graduate student gets in studying modules and in functional analysis. I didn’t have much background in algebraic topology where the subject is usually developed considerably further.Frankly, I found Goldblatt’s “gentle” approach to categorical concepts and the concept of a topos very rewarding. I worked through most of the book in a summer, and was fully prepared to take on the more advanced texts at that point. Later, I had the opportunity to teach topos theory at the graduate level to people with backgrounds similar to mine (i.e., without a strong background in category theory). We worked through most of Goldblatt’s book in the first semester and I guarantee that all the students were very grateful, as I had been, for Goldblatt’s approach to the subject.The book is well written, accessible to graduate students, filled with fun and often challenging exercises, and packed with references. In my opinion, it is the right place to start if you want to become proficient in topos theory (and you don’t already have significant proficiency in category theory).

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