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Existing fracture literature can plausibly supply independent measurements, but a named open dataset with broad matched coverage is not established here. Compilation can resolve the effect in restricted regimes, while the universal forbidden-speed wording is harder to establish. https://w3id.org/delphi/resource/assessment/buehler-2007-silicon-crack-01--gpt http://purl.org/dc/terms/subject https://w3id.org/delphi/resource/concept/dataset-resolvability-0.2.0 https://w3id.org/delphi/resource/assessment/buehler-2007-silicon-crack-01--gpt http://www.w3.org/1999/02/22-rdf-syntax-ns#type https://w3id.org/delphi/ontology/LLMClaimAssessment https://w3id.org/delphi/resource/assessment/buehler-2007-silicon-crack-01--gpt http://www.w3.org/2000/01/rdf-schema#comment Proposed test with existing data: Compile time-resolved crack-tip position in loaded single-crystal silicon, estimate velocity immediately after initiation, and test whether observations occupy zero or speeds at and above about 2 km/s with a gap below the threshold. 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