{"id":"https://openalex.org/W1979916222","doi":"https://doi.org/10.1007/s00224-007-2014-y","title":"On the Power of Unambiguity in Alternating Machines","display_name":"On the Power of Unambiguity in Alternating Machines","publication_year":2007,"publication_date":"2007-07-19","ids":{"openalex":"https://openalex.org/W1979916222","doi":"https://doi.org/10.1007/s00224-007-2014-y","mag":"1979916222"},"language":"en","primary_location":{"id":"doi:10.1007/s00224-007-2014-y","is_oa":false,"landing_page_url":"https://doi.org/10.1007/s00224-007-2014-y","pdf_url":null,"source":{"id":"https://openalex.org/S4210177266","display_name":"Theory of Computing Systems","issn_l":"0025-5661","issn":["0025-5661","1432-4350","1433-0490"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319900","host_organization_name":"Springer Science+Business Media","host_organization_lineage":["https://openalex.org/P4310319900","https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Science+Business Media","Springer Nature"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Theory of Computing Systems","raw_type":"journal-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/A5079433563","display_name":"Holger Spakowski","orcid":null},"institutions":[{"id":"https://openalex.org/I44260953","display_name":"Heinrich Heine University D\u00fcsseldorf","ror":"https://ror.org/024z2rq82","country_code":"DE","type":"education","lineage":["https://openalex.org/I44260953"]}],"countries":["DE"],"is_corresponding":true,"raw_author_name":"Holger Spakowski","raw_affiliation_strings":["Institut fur Informatik, Heinrich-Heine-Universitat Dusseldorf, 40225 Dusseldorf, Germany","Institut fur Informatik, Heinrich-Heine-Universitat Dusseldorf, 40225 Dusseldorf, Germany#TAB#"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Institut fur Informatik, Heinrich-Heine-Universitat Dusseldorf, 40225 Dusseldorf, Germany","institution_ids":["https://openalex.org/I44260953"]},{"raw_affiliation_string":"Institut fur Informatik, Heinrich-Heine-Universitat Dusseldorf, 40225 Dusseldorf, Germany#TAB#","institution_ids":["https://openalex.org/I44260953"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5051292203","display_name":"Rahul Tripathi","orcid":"https://orcid.org/0000-0001-5587-0888"},"institutions":[{"id":"https://openalex.org/I2613432","display_name":"University of South Florida","ror":"https://ror.org/032db5x82","country_code":"US","type":"education","lineage":["https://openalex.org/I2613432"]}],"countries":["US"],"is_corresponding":true,"raw_author_name":"Rahul Tripathi","raw_affiliation_strings":["Department of Computer Science and Engineering, University of South Florida, Tampa, FL 33620, USA","Department of Computer Science and Engineering, University of South Florida, Tampa, FL 33620, USA#TAB#"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Computer Science and Engineering, University of South Florida, Tampa, FL 33620, USA","institution_ids":["https://openalex.org/I2613432"]},{"raw_affiliation_string":"Department of Computer Science and Engineering, University of South Florida, Tampa, FL 33620, USA#TAB#","institution_ids":["https://openalex.org/I2613432"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5051292203","https://openalex.org/A5079433563"],"corresponding_institution_ids":["https://openalex.org/I2613432","https://openalex.org/I44260953"],"apc_list":{"value":2890,"currency":"USD","value_usd":2890},"apc_paid":null,"fwci":0.3612,"has_fulltext":false,"cited_by_count":2,"citation_normalized_percentile":{"value":0.62620954,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":"41","issue":"2","first_page":"291","last_page":"326"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10720","display_name":"Complexity and Algorithms in Graphs","score":0.9993000030517578,"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/T10720","display_name":"Complexity and Algorithms in Graphs","score":0.9993000030517578,"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/T12002","display_name":"Computability, Logic, AI Algorithms","score":0.9973000288009644,"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/T11567","display_name":"semigroups and automata theory","score":0.9970999956130981,"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/turing-machine","display_name":"Turing machine","score":0.7897822260856628},{"id":"https://openalex.org/keywords/complexity-class","display_name":"Complexity class","score":0.5908492803573608},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.516089141368866},{"id":"https://openalex.org/keywords/pspace","display_name":"PSPACE","score":0.5133792161941528},{"id":"https://openalex.org/keywords/turing","display_name":"Turing","score":0.48377200961112976},{"id":"https://openalex.org/keywords/bounded-function","display_name":"Bounded function","score":0.4788351356983185},{"id":"https://openalex.org/keywords/time-complexity","display_name":"Time complexity","score":0.4738079607486725},{"id":"https://openalex.org/keywords/oracle","display_name":"Oracle","score":0.4716559946537018},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.45367002487182617},{"id":"https://openalex.org/keywords/class","display_name":"Class (philosophy)","score":0.4374714493751526},{"id":"https://openalex.org/keywords/expressive-power","display_name":"Expressive power","score":0.4344172477722168},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.42499661445617676},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.2967051863670349},{"id":"https://openalex.org/keywords/theoretical-computer-science","display_name":"Theoretical computer science","score":0.20465019345283508},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.17838701605796814},{"id":"https://openalex.org/keywords/computational-complexity-theory","display_name":"Computational complexity theory","score":0.15896058082580566},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.09805124998092651},{"id":"https://openalex.org/keywords/computation","display_name":"Computation","score":0.05600813031196594},{"id":"https://openalex.org/keywords/programming-language","display_name":"Programming language","score":0.045875370502471924}],"concepts":[{"id":"https://openalex.org/C29248071","wikidata":"https://www.wikidata.org/wiki/Q163310","display_name":"Turing machine","level":3,"score":0.7897822260856628},{"id":"https://openalex.org/C39637292","wikidata":"https://www.wikidata.org/wiki/Q908207","display_name":"Complexity class","level":3,"score":0.5908492803573608},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.516089141368866},{"id":"https://openalex.org/C197685441","wikidata":"https://www.wikidata.org/wiki/Q500716","display_name":"PSPACE","level":3,"score":0.5133792161941528},{"id":"https://openalex.org/C9870796","wikidata":"https://www.wikidata.org/wiki/Q490481","display_name":"Turing","level":2,"score":0.48377200961112976},{"id":"https://openalex.org/C34388435","wikidata":"https://www.wikidata.org/wiki/Q2267362","display_name":"Bounded function","level":2,"score":0.4788351356983185},{"id":"https://openalex.org/C311688","wikidata":"https://www.wikidata.org/wiki/Q2393193","display_name":"Time complexity","level":2,"score":0.4738079607486725},{"id":"https://openalex.org/C55166926","wikidata":"https://www.wikidata.org/wiki/Q2892946","display_name":"Oracle","level":2,"score":0.4716559946537018},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.45367002487182617},{"id":"https://openalex.org/C2777212361","wikidata":"https://www.wikidata.org/wiki/Q5127848","display_name":"Class (philosophy)","level":2,"score":0.4374714493751526},{"id":"https://openalex.org/C195818886","wikidata":"https://www.wikidata.org/wiki/Q5421724","display_name":"Expressive power","level":2,"score":0.4344172477722168},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.42499661445617676},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.2967051863670349},{"id":"https://openalex.org/C80444323","wikidata":"https://www.wikidata.org/wiki/Q2878974","display_name":"Theoretical computer science","level":1,"score":0.20465019345283508},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.17838701605796814},{"id":"https://openalex.org/C179799912","wikidata":"https://www.wikidata.org/wiki/Q205084","display_name":"Computational complexity theory","level":2,"score":0.15896058082580566},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.09805124998092651},{"id":"https://openalex.org/C45374587","wikidata":"https://www.wikidata.org/wiki/Q12525525","display_name":"Computation","level":2,"score":0.05600813031196594},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.045875370502471924},{"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:10.1007/s00224-007-2014-y","is_oa":false,"landing_page_url":"https://doi.org/10.1007/s00224-007-2014-y","pdf_url":null,"source":{"id":"https://openalex.org/S4210177266","display_name":"Theory of Computing Systems","issn_l":"0025-5661","issn":["0025-5661","1432-4350","1433-0490"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319900","host_organization_name":"Springer Science+Business Media","host_organization_lineage":["https://openalex.org/P4310319900","https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Science+Business Media","Springer Nature"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Theory of Computing Systems","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":25,"referenced_works":["https://openalex.org/W1970755596","https://openalex.org/W1972556723","https://openalex.org/W2000291823","https://openalex.org/W2006163669","https://openalex.org/W2010937503","https://openalex.org/W2016666233","https://openalex.org/W2017290750","https://openalex.org/W2021084256","https://openalex.org/W2029980187","https://openalex.org/W2045924252","https://openalex.org/W2046843996","https://openalex.org/W2060270693","https://openalex.org/W2065251436","https://openalex.org/W2068944040","https://openalex.org/W2070323038","https://openalex.org/W2072015126","https://openalex.org/W2072727451","https://openalex.org/W2080370600","https://openalex.org/W2085634981","https://openalex.org/W2116968277","https://openalex.org/W2118798198","https://openalex.org/W2143997771","https://openalex.org/W2165399550","https://openalex.org/W3162010657","https://openalex.org/W4285719527"],"related_works":["https://openalex.org/W2085484366","https://openalex.org/W1486286946","https://openalex.org/W2122747219","https://openalex.org/W2146459129","https://openalex.org/W2950065312","https://openalex.org/W278676640","https://openalex.org/W4302414675","https://openalex.org/W1993180032","https://openalex.org/W2482914130","https://openalex.org/W2949308819"],"abstract_inverted_index":null,"counts_by_year":[],"updated_date":"2026-07-28T07:46:37.118299","created_date":"2025-10-10T00:00:00"}