FOM: Trad.vers.Funct.Algebra #1

[wtait@ix.netcom.com]

Walter, I have been enjoying your series of notes on Trad, vs Funct. 
Algebra. But, about:

>In the meantime, geometers had invented the concept of
>category and put it to use; the first, long paper I remember
>was by Charles Ehresmann 1956 who applied them to describe
>the complicated situations occurring for differentiable
>manifolds

The notion of category was introduced in ``General theory of natural 
equivalences'' by Eilenberg and MacLane in 1945 with applications to 
topology. (Trans AMS 58, pp 231-294)