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A two-stage Postnikov system where $E\sb{2}\not=E\sb{\infty }$ in the Eilenberg-Moore spectral sequence
Let $\Omega B \to PB \to B$ be the path fibration over the simply-connected space $B$, let $\Omega B \to E \to X$ be the induced fibration via the map $f:X \to B$, and let $X$ and $B$ be generalized Eilenberg-Mac Lane spaces. G. Hirsch has conjectured that ${H^ \ast …