{"title":"模态逻辑的子公式性质的新的修正","authors":"M. Takano","doi":"10.18778/0138-0680.2020.15","DOIUrl":null,"url":null,"abstract":"A modified subformula property for the modal logic KD with the additional axiom \n$\\Box\\Diamond(A\\vee B)\\supset\\Box\\Diamond A\\vee\\Box\\Diamond B$ is shown. \nA new modification of the notion of subformula is proposed for this purpose. \nThis modification forms a natural extension of our former one \non which modified subformula property for the modal logics K5, K5D and S4.2 has been shown \n(Bull Sect Logic 30:115--122, 2001 and 48:19--28, 2019). \nThe finite model property as well as decidability for the logic follows from this.","PeriodicalId":38667,"journal":{"name":"Bulletin of the Section of Logic","volume":" ","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2020-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":"{\"title\":\"New New Modification of the Subformula Property for a Modal Logic\",\"authors\":\"M. Takano\",\"doi\":\"10.18778/0138-0680.2020.15\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A modified subformula property for the modal logic KD with the additional axiom \\n$\\\\Box\\\\Diamond(A\\\\vee B)\\\\supset\\\\Box\\\\Diamond A\\\\vee\\\\Box\\\\Diamond B$ is shown. \\nA new modification of the notion of subformula is proposed for this purpose. \\nThis modification forms a natural extension of our former one \\non which modified subformula property for the modal logics K5, K5D and S4.2 has been shown \\n(Bull Sect Logic 30:115--122, 2001 and 48:19--28, 2019). \\nThe finite model property as well as decidability for the logic follows from this.\",\"PeriodicalId\":38667,\"journal\":{\"name\":\"Bulletin of the Section of Logic\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2020-08-15\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Bulletin of the Section of Logic\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.18778/0138-0680.2020.15\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"Arts and Humanities\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of the Section of Logic","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.18778/0138-0680.2020.15","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"Arts and Humanities","Score":null,"Total":0}
New New Modification of the Subformula Property for a Modal Logic
A modified subformula property for the modal logic KD with the additional axiom
$\Box\Diamond(A\vee B)\supset\Box\Diamond A\vee\Box\Diamond B$ is shown.
A new modification of the notion of subformula is proposed for this purpose.
This modification forms a natural extension of our former one
on which modified subformula property for the modal logics K5, K5D and S4.2 has been shown
(Bull Sect Logic 30:115--122, 2001 and 48:19--28, 2019).
The finite model property as well as decidability for the logic follows from this.