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The conjecture that Grushin spectral multiplier and Bochner–Riesz estimates hold with topological dimension
Dimension-reduction conjecture. The previous theorems should remain true with $D=d_1+d_2$ in place of $D=\max\{d_1+d_2,2d_2\}$ .
Conjectureopenbochner-riesz-summability grushin-operators spectral-multipliersarXiv posted 2 days ago

The conjecture that Grushin spectral multiplier and Bochner–Riesz estimates hold with topological dimension