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Abstract

Using the theory of resolving classes, we show that if $X$ is a CW complex of finite type such that ${\rm map}_*(X, S^{2n+1})\sim *$ for all sufficiently large $n$, then ${\rm map}_*(X, K) \sim *$ for every simply-connected finite-dimensional CW complex $K$; and under mild hypotheses on $\pi_1(X)$, the same conclusion holds for all finite-dimensional complexes $K$. Since it is comparatively easy to prove the former condition for $X = B\mathbb Z/p$ (we give a proof in an appendix), this result can be applied to give a new, more elementary proof of the Sullivan conjecture.