The cone multiplier conjecture
Let n≥3n\geq 3n≥3, write ξ=(ξ′,ξn)∈Rn\xi=(\xi',\xi_n)\in\mathbb{R}^nξ=(ξ′,ξn)∈Rn with ξ′∈Rn−1\xi'\in\mathbb{R}^{n-1}ξ′∈Rn−1, and let λ>0\lambda>0λ>0 and R>0R>0R>0. For a non-negative function φ∈Cc∞([1/2,2])\varphi\in C_c^{\infty}([1/2,2])φ∈Cc∞([1/2,2])…
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