Duality between proper homotopy theory and strong shape theory In the n-lab entry about shape theory one can read that 

Strong Shape Theory [...] has, especially
  in the approach pioneered by Edwards
  and Hastings, strong links to proper
  homotopy theory. The links are a form
  of duality related to some of the more
  geometric duality theorems of
  classical cohomology.

I would be interested in any reference where I can find a precise formulation of this duality. 
EDIT: according to Gjergji Zaimi's answer the duality might be an improvement of Chapman's complement theorem. One can find it as Theorem 6.5.3 on page 230 of the book by Edwards and Hastings ("Cech and Steenrod Homotopy Theories with Applications to Geometric Topology"). Nevertheless, it seems to me that what was meant on the n-lab entry was more a cohomology type duality (like an instance of Verdier duality in the $(\infty,1)$-ctageorical context). Am I completely wrong?
 A: I wrote that part of the nLab entry so can confirm that it is the Edwards and Hastings extension of Chapman's result that was referred to, but my feeling in this is that that result is the geometric form of a lot of the classical cohomological duality results and that there should be more to be said about this ... but I don't know what! Perhaps looking at the Chapman result in the light of modern homotopy theory (say using Lurie's notion of shape) may give an $(\infty,1)$-categorical result. (Note that Batanin did work on strong shape theory and produced an $A_\infty$-structure, which must relate to this. Now I like that set of ideas.  Good luck if you try it!)
(You may spur me on to write more on that entry as it has got stalled...  Alternatively anyone else is welcome to write more on strong shape, of course.... and to correct any miswording, typos that they find. :-))
A: A quick summary of the story is told in section 7 of S. Mardešić's "Shape Theory" from the ICM proceedings (1978) (find here). Strong shape theory was introduced by Edwards and Hastings keeping in mind this duality, which was inspired by Chapman's complement theorem (mentioned in the nlab article).
