{“状态”:“确定”,“消息类型”:“工作”,“信息版本”:“1.0.0”,“邮件”:{“索引”:{-“日期-部件”:[[2023,2,17]],“日期-时间”:“2023-02-17T16:51:40Z”,“时间戳”:1676652700717},“参考-计数”:11,“出版商”:“剑桥大学出版社(CUP)”,“发行”:“2”,“许可证”:[{“开始”:{:“日期-零件”:[2014,3,12]],“时间”:“2014-03-12T00:00:00Z”,“时间戳”:1394582400000},“content-version”:“unspecified”,“delay-in-days”:2476,“URL”:“https:\/\/www.cambridge.org\/core\/terms”}],“content-domain”:{“domain”:[],“crossmark-restriction”:false},”short-container-title“:[”J.symb.log.“],”published-print“:{”date-parts“:[[2007,6]}”,“abstract”:“”摘要<\/jats:title>我们观察到,W*-层次结构(由Downey、Fellows和Taylor[7]引入)是更著名的W层次结构的变体,它与W层次结构相一致,虽然不是层次结构,但只是一个整体层次结构。更准确地说,我们证明了W[t<\/jats:italic>]\u2286宽*[t<\/jats:italic>]\u2286宽[2t<\/jats:italic>\u2212 2]t<\/jats:italic>\u2265 2。之前就知道W[1<\/jats:italic>]=W*[1]和W[2]=W*[2]<\/jats:p>我们的第二个主要结果是根据\u201cFagin-defined问题对W*-层次结构进行了新的逻辑表征。\u201d作为一个副产品,我们还改进了我们之前在模型检查问题方面对层次结构的描述。此外,我们还得到了类W[3]和W*[3]的新的完全问题<\/jats:p>“,”DOI“:”10.2178\/jsl\/1185803622“,”type“:”journal-article“,”created“:{”date-parts“:[[2007,12,19]],”date-time“:”2007-12-19T16:24:48Z“,”timestamp“:1198081488000},”page“:“513-534”,“source”:“Crossref”,“is-referenced-by-count”:3,“title”:[“W*-层次结构分析”],“前缀”:“10.1017”,“volume”“:”72“,”作者“:[{”给定“:”一家“,”家庭“:”Chen”,“sequence”:“first”,“affiliation”:[]},{“given”:“J\u00f6rg”,“family”:“Flum”,“serquence”,“additional”:“affidiation”:[]}20000534X_ref005“,”doi-asserted-by“:”publisher“,“doi”:“10.1007\/978-1-4612-0515-9“},{“key”:“S002248120000534X_ref007”,“first page”:”194“,“volume-title”:“DMTCS’96的组合数学、复杂性和逻辑2013会议录”,“author”:“Downey”,“year”:“1996”},}“key:”S002248.120000534x_ref011“,”volume-title“:”Die W*-Hierarchie“,”author“:”Landes“,”year“:”2005“}”,{键“:”S002248120000534X_ref010“,”volume-title“:“参数化复杂性理论”,“author”:“Flum”,“year”:“2006”},{“key”:“S002248120000534X_ref001”,“volume-tite”:“计算系统理论”,”author“:”Buss“},”{“key”:”S002248212000534X_ref003“,”doi-asserted-by“:”publisher“,“doi”:“10.1016\/0304-3975(94)00097-3”}“,{”key“:”S022481200005534X_re f004“,”doi-asserted-by“:”publisher“,“doi”:“10.1016\/S0304-3975(97)00101-1“},{“key”:“S002248120000534X_ref006”,“doi-asserted-by”:“publisher”,”doi“:”10.1090\/dimacs\/039\/07“}”,{”key“:”S002248.120000534x_ref008“,”doi-assert-by“:”publisher“,“doi”:“10.1137\/S009753799360768”},“key“:”S0022812000534X_ref009“,”doi-asserted-by“:”publisher“,”doi“:”10.2168 \/LMCS-1(1:2)2005“},{”key“:”S002248120000534X_ref002“,“doi-asserted-by”:“publisher”,“doi”:“10.1137\/S0097539792228228”}],“container-title”:[“符号逻辑杂志”],“原始标题”:[],“语言”:“en”,“链接”:[{“URL”:“https:\/\/www.cambridge.org\/core\/services\/aop-cambridge-core\/content\/view\/S00224812000534X”,“内容类型”:“未指定”,“content-version”:“vor”,“intended-application“:”similarity-checking“}],”deposed“:{”date-parts“:[[2019,5,1]],”date-time“:”2019-05-01T22:12:40Z“,”timestamp“:1556748760000},”score“:1,”resource“:{“primary”:{“URL”:“https:\/\/www.cambridge.org\/core\/product\/identifier\/S002248120000534X\/type\/journal_article“}}”,“subtitle”:[],“shorttitle”:[],“发布”:{“日期-部分”:[[2007,6]]},“references-count”:11,“journal-issue”:{“issue”:“2”,“published-print”:{“date-parts”:[[2007,6]]}},“alternative-id”:[“S002248120000534X”],“URL”:“http://\/dx.doi.org\/10.2178\/jsl\/1185803622”,“relation”:{},”ISSN“:[”0022-4812“,”1943-5886“],“ISSN-type”:[{“value”:“0022-4812”,“类型”:“打印”},{“值”:“1943-5886”,“种类”:“电子”}],“主题”:[],“已发布”:{“日期部分”:[[2007,6]]}}}