Unique Continuation for $|\Delta u| ≤ V \; |\nabla u|$ and Related Problems

Unique Continuation for $∣Δ u ∣ \leq V ∣\nabla u ∣$ and Related Problems

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Thomas H. Wolff, Unique Continuation for $∣Δ u ∣ \leq V ∣\nabla u ∣$ and Related Problems. Rev. Mat. Iberoam. 6 (1990), no. 4, pp. 155–200