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Published online by Cambridge University Press: 20 November 2018
A sharp upper bound on the first   ${{S}^{1}}$  invariant eigenvalue of the Laplacian for
 ${{S}^{1}}$  invariant eigenvalue of the Laplacian for   ${{S}^{1}}$  invariant metrics on
 ${{S}^{1}}$  invariant metrics on   ${{S}^{2}}$  is used to find obstructions to the existence of
 ${{S}^{2}}$  is used to find obstructions to the existence of   ${{S}^{1}}$  equivariant isometric embeddings of such metrics in (
 ${{S}^{1}}$  equivariant isometric embeddings of such metrics in (  ${{\mathbb{R}}^{3}}$ , can). As a corollary we prove: If the first four distinct eigenvalues have even multiplicities then the metric cannot be equivariantly, isometrically embedded in (
 ${{\mathbb{R}}^{3}}$ , can). As a corollary we prove: If the first four distinct eigenvalues have even multiplicities then the metric cannot be equivariantly, isometrically embedded in (  ${{\mathbb{R}}^{3}}$ , can). This leads to generalizations of some classical results in the theory of surfaces.
 ${{\mathbb{R}}^{3}}$ , can). This leads to generalizations of some classical results in the theory of surfaces.