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  • Print publication year: 2010
  • Online publication date: June 2011

PART I - ABSTRACT ALGEBRAIC CATEGORIES

Summary

It should be observed first that the whole concept of category is essentially an auxiliary one; our basic concepts are those of a functor and a natural transformation.

– S. Eilenberg and S. Mac Lane (1945), General theory of natural equivalences, Trans. Amer. Math. Soc.58: 247