AlgorithmAlgorithm: Literature-sourcedProof: Not applicablePipeline-generatedverified 2026-10-22 (gpt-6.1-sol)

How statement and proof provenance work

The first chip identifies the source of the statement or construction; the second identifies the source of its local proof or verification.

Literature-sourced: the exact statement appears in a cited source; only wording and notation differ.
AI-adapted: a semantically identical restatement of literature-sourced material, modulo indexing, notation, and boundary cases adopted by the library.
AI-generated: a genuinely novel statement formulated by AI, with no source for the claim itself.

These labels describe origin, not correctness: citations and verification chips remain separate evidence.

Singular-value cutoff estimator

Definition

Input a normalized sequence observation $z = (z_{j})_{j \in N_{> 0}} \in R^{N_{> 0}}$ from the Gaussian sequence inverse model and a cutoff $D \in N_{0}$ , where $N_{0} = {0, 1, 2, \dots}$ . Output the finite-support estimate ${\hat{θ}}_{D} (z) \in ℓ^{2} (N_{> 0}, R)$ defined by ${\hat{θ}}_{D, j} (z) = {\begin{cases} z_{j}, & 1 \leq j \leq D, \\ 0, & j > D . \end{cases}$ For $D = 0$ the output is the zero sequence.

Definition references

Gaussian sequence inverse model

Litao Ding and Peter Mathé, Minimax rates for statistical inverse problems under general source conditions, equation (11), PDF p. 3

Iain M. Johnstone, Gaussian estimation: Sequence and wavelet models, §3.2, equation (3.12), printed p. 61

Depends on

Gaussian sequence inverse model

Used by

Dependency tree · two levels

9 results within two dependency steps of this one, each drawn at its shortest distance from it. An arrow runs from a result to what uses it, so the chart reads left to right and ends at this result, which carries a heavier outline. Every node is a link to that result. Click elsewhere on the chart to enlarge it.

Sources

Litao Ding and Peter Mathé, Minimax rates for statistical inverse problems under general source conditions, equation (11), PDF p. 3 (standard reference, not scraped)
Iain M. Johnstone, Gaussian estimation: Sequence and wavelet models, §3.2, equation (3.12), printed p. 61 (standard reference, not scraped)