{"title":"具有非密集准时度的离散线性序列","authors":"Kai Jun Khoo, Heer Tern Koh, Keng Meng Ng","doi":"10.1016/j.tcs.2025.115324","DOIUrl":null,"url":null,"abstract":"<div><div>This paper contributes to a systematic study of <em>punctual structures</em>, which are structures computable without delay. The (punctual) degree structure induced by treating “being primitive recursively isomorphic” as a reduction provides insight into the different speeds of enumerations of a given structure. In this paper, we work towards a classification of density of the punctual degrees for linear orders. More specifically, we construct a discrete linear order whose punctual degrees are not dense.</div></div>","PeriodicalId":49438,"journal":{"name":"Theoretical Computer Science","volume":"1047 ","pages":"Article 115324"},"PeriodicalIF":0.9000,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A discrete linear order with non-dense punctual degrees\",\"authors\":\"Kai Jun Khoo, Heer Tern Koh, Keng Meng Ng\",\"doi\":\"10.1016/j.tcs.2025.115324\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This paper contributes to a systematic study of <em>punctual structures</em>, which are structures computable without delay. The (punctual) degree structure induced by treating “being primitive recursively isomorphic” as a reduction provides insight into the different speeds of enumerations of a given structure. In this paper, we work towards a classification of density of the punctual degrees for linear orders. More specifically, we construct a discrete linear order whose punctual degrees are not dense.</div></div>\",\"PeriodicalId\":49438,\"journal\":{\"name\":\"Theoretical Computer Science\",\"volume\":\"1047 \",\"pages\":\"Article 115324\"},\"PeriodicalIF\":0.9000,\"publicationDate\":\"2025-05-19\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Theoretical Computer Science\",\"FirstCategoryId\":\"94\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0304397525002622\",\"RegionNum\":4,\"RegionCategory\":\"计算机科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"COMPUTER SCIENCE, THEORY & METHODS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Theoretical Computer Science","FirstCategoryId":"94","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0304397525002622","RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"COMPUTER SCIENCE, THEORY & METHODS","Score":null,"Total":0}
A discrete linear order with non-dense punctual degrees
This paper contributes to a systematic study of punctual structures, which are structures computable without delay. The (punctual) degree structure induced by treating “being primitive recursively isomorphic” as a reduction provides insight into the different speeds of enumerations of a given structure. In this paper, we work towards a classification of density of the punctual degrees for linear orders. More specifically, we construct a discrete linear order whose punctual degrees are not dense.
期刊介绍:
Theoretical Computer Science is mathematical and abstract in spirit, but it derives its motivation from practical and everyday computation. Its aim is to understand the nature of computation and, as a consequence of this understanding, provide more efficient methodologies. All papers introducing or studying mathematical, logic and formal concepts and methods are welcome, provided that their motivation is clearly drawn from the field of computing.