Kahler differentials, the T-functor, and a theorem of Steinberg
W. G. Dwyer and C. W. Wilkerson
Let $T$ be the functor on the category of unstable algebras over
the Steenrod algebra constructed by Lannes. We use an argument
involving Kahler differentials to show that $T$ preserves polynomial
algebras. This leads to new and relatively simple proofs of some
topological and algebraic theorems.
( This is a somewhat shorter ( examples deleted ) of the
original version posted 7/16/97, CWW).
(This is the final version of the paper. 9/15/97. CWW)