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