analysis / Nonlocal operators

Nazarov's Conjecture on Truncations for Fractional Laplacians

Nazarov conjectured that for $s \in (1, 3/2)$ the quadratic form of the spectral fractional Dirichlet Laplacian strictly increases under $u \mapsto |u|$ when $u$ changes sign. Proved and substantially generalized, with the same conclusion for the restricted form.

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analysisAug 5, 2026Significance 8/100Registry: unreviewed

Nazarov's Conjecture on Truncations for Fractional Laplacians

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Nazarov conjectured that for $s \in (1, 3/2)$ the quadratic form of the spectral fractional Dirichlet Laplacian strictly increases under $u \mapsto |u|$ when $u$ changes sign. Proved and substantially generalized, with the same conclusion for the restricted form.

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Nazarov conjectured that for $s \in (1, 3/2)$ the quadratic form of the spectral fractional Dirichlet Laplacian strictly increases under $u \mapsto |u|$ when $u$ changes sign. Proved and substantially generalized, with the same conclusion for the restricted form.

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