Homotopy is not concrete

Peter Freyd

Originally published in:
The Steenrod Algebra and its Applications, Springer Lecture Notes in Mathematics Vol. 168,
© Springer-Verlag, 1970 and used by permission.

Keywords: Concrete categories, homotopy theory

2000 MSC: 18B30, 55P15

Republished in:
Reprints in Theory and Applications of Categories, No. 6 (2004) pp 1-10

http://www.tac.mta.ca/tac/reprints/articles/6/tr6.dvi
http://www.tac.mta.ca/tac/reprints/articles/6/tr6.ps
http://www.tac.mta.ca/tac/reprints/articles/6/tr6.pdf

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