A Generalization of The Triad Theorem of Blakers-Massey.
Wojciech Chacholski
Let F-->A-->X and H-->A-->E be fibration sequences.
Take the homotopy push-out B=hocolim(X<--A-->E), and then
take the homotopy pull-back Y=holim(X-->B<--E).
There is a nautral map q:A-->Y. The main statemant of the paper
is that if F and H are connected, then the homotopy fiber of
the suspenson of q is built from the smash of F and H using
homotopy push-outs, wedges and telescopes.