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CounterexampleConstruction: AI-generatedVerification: AI-generatedPipeline-generatedprecheck passjudge pass (gpt-5.6-terra)audited 2026-09-07
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Gaps tending to infinity need not be Hadamard-lacunary

Statement refuted

“If an increasing integer sequence has gaps tending to infinity, then it is Hadamard-lacunary.”

Facts & Assumptions

Given: The increasing sequence λj=j2 for j1.

Counterexample

technique · direct gap and ratio calculation
1.1

Its successive gaps are [given, algebra] λj+1λj=(j+1)2j2=2j+1.

givenalgebra
2.1

But [step 1.1, algebra] λj+1λj=(1+1j)21. Hence no fixed q>1 can satisfy the ratio condition eventually, much less at every index. This violates the definition in Hadamard-lacunary sequences and lacunary trigonometric series.

step 1.1algebra

Depends on

Used by

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Dependency tree · two levels

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Sources