#
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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