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# Questions

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### First eigenvalue of the Laplacian on Berger spheres

jun 19 11 at 22:27 Renato G Bettiol 2,070512

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499
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### Isometry groups of Riemannian submersions with totally geodesic fibers

jan 25 12 at 7:22 MathOverflow 123

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446
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### Multiplicity of eigenvalues of the Laplacian on quaternionic projective space

oct 25 11 at 19:10 Joseph Wolf 39624

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417
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### Behavior of sectional curvature under metric deformations

jan 16 12 at 5:12 Renato G Bettiol 2,070512

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### Possible isometries of a positively curved $S^2\times S^2$

may 1 at 16:27 Luis Guijarro 413

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### Characterizing Hessians among symmetric bilinear tensors

mar 7 at 16:10 Robert Bryant 21.8k37597

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### “Homogeneity” of the Hopf fibration $S^7\to S^{15}\to S^8$ [closed]

nov 29 at 2:16 Renato G Bettiol 2,070512

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219
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### Open problems about CMC hypersurfaces with symmetries?

oct 4 at 2:55 Renato G Bettiol 2,070512

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### Minimal distance spheres in complex projective spaces

aug 23 at 17:36 Greg Kuperberg 36.2k2116179

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