Date: Wed, 20 Jan 1999 01:23:22 GMT
From: carlos@picard.ups-tlse.fr (Carlos Simpson)
Subject: Re: response to R. Brown

As predicted by Andrzej Kozlowski, ``the study of well-defined things''
does seem like a good answer. This provides an occasion to post to the
topology list, where it belongs, a question raised a while ago on
``categories'' (my apologies to the probably large number of you who
subscribe to both lists).

To be brief: it is often stated that ``one of the major problems in topology
is the homotopy groups of spheres''. What is the ``well-defined'' question
here? For example, is there an explicit conjecture that needs to be proved?

---Carlos Simpson