{"id":"https://openalex.org/W2078803743","doi":"https://doi.org/10.1145/2603088.2603107","title":"One hierarchy spawns another","display_name":"One hierarchy spawns another","publication_year":2014,"publication_date":"2014-07-14","ids":{"openalex":"https://openalex.org/W2078803743","doi":"https://doi.org/10.1145/2603088.2603107","mag":"2078803743"},"language":"en","primary_location":{"id":"doi:10.1145/2603088.2603107","is_oa":false,"landing_page_url":"https://doi.org/10.1145/2603088.2603107","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Proceedings of the Joint Meeting of the Twenty-Third EACSL Annual Conference on Computer Science Logic (CSL) and the Twenty-Ninth Annual ACM/IEEE Symposium on Logic in Computer Science (LICS)","raw_type":"proceedings-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5110074953","display_name":"Hubie Chen","orcid":null},"institutions":[{"id":"https://openalex.org/I169108374","display_name":"University of the Basque Country","ror":"https://ror.org/000xsnr85","country_code":"ES","type":"education","lineage":["https://openalex.org/I169108374"]},{"id":"https://openalex.org/I110594554","display_name":"Ikerbasque","ror":"https://ror.org/01cc3fy72","country_code":"ES","type":"other","lineage":["https://openalex.org/I110594554"]}],"countries":["ES"],"is_corresponding":true,"raw_author_name":"Hubie Chen","raw_affiliation_strings":["Universidad del Pa\u00eds Vasco and IKERBASQUE, Basque Foundation for Science, San Sebasti\u00e1n, Spain"],"affiliations":[{"raw_affiliation_string":"Universidad del Pa\u00eds Vasco and IKERBASQUE, Basque Foundation for Science, San Sebasti\u00e1n, Spain","institution_ids":["https://openalex.org/I110594554","https://openalex.org/I169108374"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5011254078","display_name":"Moritz M\u00fcller","orcid":null},"institutions":[{"id":"https://openalex.org/I129774422","display_name":"University of Vienna","ror":"https://ror.org/03prydq77","country_code":"AT","type":"education","lineage":["https://openalex.org/I129774422"]},{"id":"https://openalex.org/I4210088715","display_name":"FH Campus Wien","ror":"https://ror.org/003f4pg83","country_code":"AT","type":"education","lineage":["https://openalex.org/I4210088715"]}],"countries":["AT"],"is_corresponding":false,"raw_author_name":"Moritz M\u00fcller","raw_affiliation_strings":["Universit\u00e4t Wien, Wien, Austria","Universitat Wien, , Wien, Austria"],"affiliations":[{"raw_affiliation_string":"Universit\u00e4t Wien, Wien, Austria","institution_ids":["https://openalex.org/I4210088715","https://openalex.org/I129774422"]},{"raw_affiliation_string":"Universitat Wien, , Wien, Austria","institution_ids":["https://openalex.org/I4210088715","https://openalex.org/I129774422"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5110074953"],"corresponding_institution_ids":["https://openalex.org/I110594554","https://openalex.org/I169108374"],"apc_list":null,"apc_paid":null,"fwci":3.9169,"has_fulltext":false,"cited_by_count":15,"citation_normalized_percentile":{"value":0.93915811,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":89,"max":99},"biblio":{"volume":null,"issue":null,"first_page":"1","last_page":"10"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10374","display_name":"Advanced Graph Theory Research","score":0.9990000128746033,"subfield":{"id":"https://openalex.org/subfields/1703","display_name":"Computational Theory and Mathematics"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10374","display_name":"Advanced Graph Theory Research","score":0.9990000128746033,"subfield":{"id":"https://openalex.org/subfields/1703","display_name":"Computational Theory and Mathematics"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10720","display_name":"Complexity and Algorithms in Graphs","score":0.9968000054359436,"subfield":{"id":"https://openalex.org/subfields/1703","display_name":"Computational Theory and Mathematics"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10142","display_name":"Formal Methods in Verification","score":0.9904999732971191,"subfield":{"id":"https://openalex.org/subfields/1703","display_name":"Computational Theory and Mathematics"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/homomorphism","display_name":"Homomorphism","score":0.7266366481781006},{"id":"https://openalex.org/keywords/parameterized-complexity","display_name":"Parameterized complexity","score":0.573635458946228},{"id":"https://openalex.org/keywords/bounded-function","display_name":"Bounded function","score":0.55535489320755},{"id":"https://openalex.org/keywords/tree-decomposition","display_name":"Tree decomposition","score":0.5078194737434387},{"id":"https://openalex.org/keywords/conjunctive-query","display_name":"Conjunctive query","score":0.5027368068695068},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.5003912448883057},{"id":"https://openalex.org/keywords/theoretical-computer-science","display_name":"Theoretical computer science","score":0.4586373269557953},{"id":"https://openalex.org/keywords/polynomial-hierarchy","display_name":"Polynomial hierarchy","score":0.42577776312828064},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.4250103831291199},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.41712772846221924},{"id":"https://openalex.org/keywords/graph","display_name":"Graph","score":0.4150981903076172},{"id":"https://openalex.org/keywords/time-complexity","display_name":"Time complexity","score":0.32927757501602173},{"id":"https://openalex.org/keywords/relational-database","display_name":"Relational database","score":0.28356844186782837},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.26921960711479187},{"id":"https://openalex.org/keywords/line-graph","display_name":"Line graph","score":0.13903844356536865},{"id":"https://openalex.org/keywords/pathwidth","display_name":"Pathwidth","score":0.12760749459266663}],"concepts":[{"id":"https://openalex.org/C4042151","wikidata":"https://www.wikidata.org/wiki/Q215111","display_name":"Homomorphism","level":2,"score":0.7266366481781006},{"id":"https://openalex.org/C165464430","wikidata":"https://www.wikidata.org/wiki/Q1570441","display_name":"Parameterized complexity","level":2,"score":0.573635458946228},{"id":"https://openalex.org/C34388435","wikidata":"https://www.wikidata.org/wiki/Q2267362","display_name":"Bounded function","level":2,"score":0.55535489320755},{"id":"https://openalex.org/C70501317","wikidata":"https://www.wikidata.org/wiki/Q462095","display_name":"Tree decomposition","level":5,"score":0.5078194737434387},{"id":"https://openalex.org/C65647387","wikidata":"https://www.wikidata.org/wiki/Q1781706","display_name":"Conjunctive query","level":3,"score":0.5027368068695068},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.5003912448883057},{"id":"https://openalex.org/C80444323","wikidata":"https://www.wikidata.org/wiki/Q2878974","display_name":"Theoretical computer science","level":1,"score":0.4586373269557953},{"id":"https://openalex.org/C2776013622","wikidata":"https://www.wikidata.org/wiki/Q2103021","display_name":"Polynomial hierarchy","level":3,"score":0.42577776312828064},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.4250103831291199},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.41712772846221924},{"id":"https://openalex.org/C132525143","wikidata":"https://www.wikidata.org/wiki/Q141488","display_name":"Graph","level":2,"score":0.4150981903076172},{"id":"https://openalex.org/C311688","wikidata":"https://www.wikidata.org/wiki/Q2393193","display_name":"Time complexity","level":2,"score":0.32927757501602173},{"id":"https://openalex.org/C5655090","wikidata":"https://www.wikidata.org/wiki/Q192588","display_name":"Relational database","level":2,"score":0.28356844186782837},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.26921960711479187},{"id":"https://openalex.org/C203776342","wikidata":"https://www.wikidata.org/wiki/Q1378376","display_name":"Line graph","level":3,"score":0.13903844356536865},{"id":"https://openalex.org/C43517604","wikidata":"https://www.wikidata.org/wiki/Q7144893","display_name":"Pathwidth","level":4,"score":0.12760749459266663},{"id":"https://openalex.org/C77088390","wikidata":"https://www.wikidata.org/wiki/Q8513","display_name":"Database","level":1,"score":0.0},{"id":"https://openalex.org/C134306372","wikidata":"https://www.wikidata.org/wiki/Q7754","display_name":"Mathematical analysis","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1145/2603088.2603107","is_oa":false,"landing_page_url":"https://doi.org/10.1145/2603088.2603107","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Proceedings of the Joint Meeting of the Twenty-Third EACSL Annual Conference on Computer Science Logic (CSL) and the Twenty-Ninth Annual ACM/IEEE Symposium on Logic in Computer Science (LICS)","raw_type":"proceedings-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[{"id":"https://openalex.org/G1395316686","display_name":null,"funder_award_id":"SAI12/219","funder_id":"https://openalex.org/F4320321705","funder_display_name":"Eusko Jaurlaritza"},{"id":"https://openalex.org/G1916637371","display_name":null,"funder_award_id":"TIN2007-66523","funder_id":"https://openalex.org/F4320321764","funder_display_name":"Ministerio de Educaci\u00f3n, Cultura y Deporte"},{"id":"https://openalex.org/G5282336716","display_name":null,"funder_award_id":"P 24654 N25","funder_id":"https://openalex.org/F4320321181","funder_display_name":"Austrian Science Fund"},{"id":"https://openalex.org/G6071679526","display_name":null,"funder_award_id":"UFI11/45","funder_id":"https://openalex.org/F4320321919","funder_display_name":"Euskal Herriko Unibertsitatea"}],"funders":[{"id":"https://openalex.org/F4320321181","display_name":"Austrian Science Fund","ror":"https://ror.org/013tf3c58"},{"id":"https://openalex.org/F4320321705","display_name":"Eusko Jaurlaritza","ror":"https://ror.org/00pz2fp31"},{"id":"https://openalex.org/F4320321764","display_name":"Ministerio de Educaci\u00f3n, Cultura y Deporte","ror":"https://ror.org/03nc27g21"},{"id":"https://openalex.org/F4320321919","display_name":"Euskal Herriko Unibertsitatea","ror":"https://ror.org/000xsnr85"}],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":38,"referenced_works":["https://openalex.org/W36639738","https://openalex.org/W43934320","https://openalex.org/W80569205","https://openalex.org/W153181359","https://openalex.org/W1482193060","https://openalex.org/W1486752157","https://openalex.org/W1558832481","https://openalex.org/W1566708570","https://openalex.org/W1570425181","https://openalex.org/W1579643516","https://openalex.org/W1603707154","https://openalex.org/W1787617900","https://openalex.org/W1881947656","https://openalex.org/W1924671213","https://openalex.org/W1979514837","https://openalex.org/W1988772559","https://openalex.org/W2003921622","https://openalex.org/W2004485491","https://openalex.org/W2026745535","https://openalex.org/W2027519504","https://openalex.org/W2033325972","https://openalex.org/W2048685245","https://openalex.org/W2087083200","https://openalex.org/W2106991838","https://openalex.org/W2111829945","https://openalex.org/W2124452950","https://openalex.org/W2159738186","https://openalex.org/W2920957129","https://openalex.org/W3039948875","https://openalex.org/W3098753775","https://openalex.org/W3104030884","https://openalex.org/W3162760903","https://openalex.org/W4206031975","https://openalex.org/W4254380579","https://openalex.org/W4285719527","https://openalex.org/W6628898632","https://openalex.org/W6633513001","https://openalex.org/W6633989784"],"related_works":["https://openalex.org/W2596756838","https://openalex.org/W2998684673","https://openalex.org/W2027519504","https://openalex.org/W2171811389","https://openalex.org/W2997249752","https://openalex.org/W2158154629","https://openalex.org/W2775695328","https://openalex.org/W2242104095","https://openalex.org/W2998138808","https://openalex.org/W1564716117"],"abstract_inverted_index":{"We":[0,50,121,183],"study":[1],"the":[2,20,42,67,70,87,115,188,196,200,203,218],"problem":[3,15,23],"of":[4,12,28,38,48,56,64,69,101,114,118,126,134,147,153,166,179,190,202,220],"conjunctive":[5],"query":[6],"evaluation":[7],"relative":[8,24],"to":[9,25,66,129,141,216],"a":[10,26,36,52,78,102,112,131,142,150,161,172],"class":[11,27],"queries;":[13],"this":[14,92,124],"is":[16,45,97,111,138],"formulated":[17],"here":[18],"as":[19,169,171],"relational":[21],"homomorphism":[22,72,135,167,197],"structures":[29,39,204],"A,":[30],"wherein":[31],"each":[32],"instance":[33],"must":[34],"be":[35],"pair":[37],"such":[40],"that":[41],"first":[43],"structure":[44],"an":[46],"element":[47],"A.":[49],"present":[51,185],"comprehensive":[53,139],"complexity":[54,68,132,164,181,219],"classification":[55,165],"these":[57],"problems,":[58,168],"which":[59,104,110,137,194],"strongly":[60],"links":[61],"graph-theoretic":[62],"properties":[63],"A":[65,206],"corresponding":[71],"problem.":[73],"In":[74,156],"particular,":[75],"we":[76,105,159,212],"define":[77],"binary":[79,95],"relation":[80,96],"on":[81],"graph":[82,107,127],"classes":[83,128],"and":[84,109,175,186],"completely":[85],"describe":[86],"resulting":[88],"hierarchy":[89,125,133],"given":[90],"by":[91],"relation.":[93],"This":[94],"defined":[98],"in":[99,205],"terms":[100],"notion":[103,117,146],"call":[106],"deconstruction":[108],"variant":[113],"well-known":[116],"tree":[119,209],"decomposition.":[120],"then":[122,184],"use":[123,213],"infer":[130],"problems":[136,198],"up":[140],"computationally":[143],"very":[144],"weak":[145],"reduction,":[148],"namely,":[149],"parameterized":[151],"version":[152],"quantifier-free":[154],"reductions.":[155],"doing":[157],"so,":[158],"obtain":[160],"significantly":[162],"refined":[163],"well":[170],"unifying,":[173],"modular,":[174],"conceptually":[176],"clean":[177],"treatment":[178],"existing":[180],"classifications.":[182],"develop":[187],"theory":[189],"Ehrenfeucht-Fra\u00efss\u00e9-style":[191],"pebble":[192],"games":[193],"solve":[195],"where":[199],"cores":[201],"have":[207],"bounded":[208,226],"depth.":[210],"Finally,":[211],"our":[214],"framework":[215],"classify":[217],"model":[221],"checking":[222],"existential":[223],"sentences":[224],"having":[225],"quantifier":[227],"rank.":[228]},"counts_by_year":[{"year":2020,"cited_by_count":1},{"year":2019,"cited_by_count":1},{"year":2018,"cited_by_count":1},{"year":2017,"cited_by_count":6},{"year":2016,"cited_by_count":1},{"year":2015,"cited_by_count":3},{"year":2014,"cited_by_count":1},{"year":2013,"cited_by_count":1}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}