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For any natural numbers $k \leq n$, the rational cohomology ring of the spaceof continuous maps $S^{2k-1} \to S^{2n-1}$ (respectively, $S^{4k-1} \toS^{4n-1}$) equivariant under the Hopf action of the circle (respectively, ofthe group $S^3$ of unit quaternions) is naturally isomorphic to that of theStiefel manifold $V_k({\mathbb C}^n)$ (respectively, $V_k({\mathbb H}^n)$). Thenatural maps of integral cohomology groups of these spaces of equivariant mapsto cohomology of Stiefel manifolds are surjective but not injective.

Cohomology of spaces of Hopf equivariant maps of spheres