{"id":"https://openalex.org/W1506801966","doi":"https://doi.org/10.1007/3-540-62950-5_78","title":"A criterion for intractability of E-unification with free function symbols and its relevance for combination of unification algorithms","display_name":"A criterion for intractability of E-unification with free function symbols and its relevance for combination of unification algorithms","publication_year":1997,"publication_date":"1997-01-01","ids":{"openalex":"https://openalex.org/W1506801966","doi":"https://doi.org/10.1007/3-540-62950-5_78","mag":"1506801966"},"language":"en","primary_location":{"id":"doi:10.1007/3-540-62950-5_78","is_oa":false,"landing_page_url":"https://doi.org/10.1007/3-540-62950-5_78","pdf_url":null,"source":{"id":"https://openalex.org/S106296714","display_name":"Lecture notes in computer science","issn_l":"0302-9743","issn":["0302-9743","1611-3349"],"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":"book series"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Lecture Notes in Computer Science","raw_type":"book-chapter"},"type":"conference-paper","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/A5109699155","display_name":"Klaus U. Schulz","orcid":null},"institutions":[{"id":"https://openalex.org/I8204097","display_name":"Ludwig-Maximilians-Universit\u00e4t M\u00fcnchen","ror":"https://ror.org/05591te55","country_code":"DE","type":"education","lineage":["https://openalex.org/I8204097"]}],"countries":["DE"],"is_corresponding":true,"raw_author_name":"Klaus U. Schulz","raw_affiliation_strings":["CIS, Universit\u00e4t M\u00fcnchen, Oettingenstra\u00dfe 67, 80538, M\u00fcnchen, Germany","Universit\u00e4t, M\u00fcnchen,"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"CIS, Universit\u00e4t M\u00fcnchen, Oettingenstra\u00dfe 67, 80538, M\u00fcnchen, Germany","institution_ids":[]},{"raw_affiliation_string":"Universit\u00e4t, M\u00fcnchen,","institution_ids":["https://openalex.org/I8204097"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":["https://openalex.org/A5109699155"],"corresponding_institution_ids":["https://openalex.org/I8204097"],"apc_list":{"value":5000,"currency":"EUR","value_usd":5392},"apc_paid":null,"fwci":0.3268,"has_fulltext":false,"cited_by_count":2,"citation_normalized_percentile":{"value":0.50885269,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":90,"max":94},"biblio":{"volume":null,"issue":null,"first_page":"284","last_page":"298"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10126","display_name":"Logic, programming, and type systems","score":0.9994000196456909,"subfield":{"id":"https://openalex.org/subfields/1702","display_name":"Artificial Intelligence"},"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/T10126","display_name":"Logic, programming, and type systems","score":0.9994000196456909,"subfield":{"id":"https://openalex.org/subfields/1702","display_name":"Artificial Intelligence"},"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/T11435","display_name":"Polynomial and algebraic computation","score":0.9930999875068665,"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/T11010","display_name":"Logic, Reasoning, and Knowledge","score":0.9732999801635742,"subfield":{"id":"https://openalex.org/subfields/1702","display_name":"Artificial Intelligence"},"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/unification","display_name":"Unification","score":0.9181370735168457},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.5254910588264465},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.5244086980819702},{"id":"https://openalex.org/keywords/function","display_name":"Function (biology)","score":0.5046590566635132},{"id":"https://openalex.org/keywords/rewriting","display_name":"Rewriting","score":0.49369487166404724},{"id":"https://openalex.org/keywords/algebra-over-a-field","display_name":"Algebra over a field","score":0.45988261699676514},{"id":"https://openalex.org/keywords/commutative-property","display_name":"Commutative property","score":0.4463448226451874},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.40399688482284546},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.40328821539878845},{"id":"https://openalex.org/keywords/pure-mathematics","display_name":"Pure mathematics","score":0.22503983974456787},{"id":"https://openalex.org/keywords/programming-language","display_name":"Programming language","score":0.10871419310569763}],"concepts":[{"id":"https://openalex.org/C96146094","wikidata":"https://www.wikidata.org/wiki/Q609057","display_name":"Unification","level":2,"score":0.9181370735168457},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.5254910588264465},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.5244086980819702},{"id":"https://openalex.org/C14036430","wikidata":"https://www.wikidata.org/wiki/Q3736076","display_name":"Function (biology)","level":2,"score":0.5046590566635132},{"id":"https://openalex.org/C154690210","wikidata":"https://www.wikidata.org/wiki/Q1668499","display_name":"Rewriting","level":2,"score":0.49369487166404724},{"id":"https://openalex.org/C136119220","wikidata":"https://www.wikidata.org/wiki/Q1000660","display_name":"Algebra over a field","level":2,"score":0.45988261699676514},{"id":"https://openalex.org/C183778304","wikidata":"https://www.wikidata.org/wiki/Q165474","display_name":"Commutative property","level":2,"score":0.4463448226451874},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.40399688482284546},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.40328821539878845},{"id":"https://openalex.org/C202444582","wikidata":"https://www.wikidata.org/wiki/Q837863","display_name":"Pure mathematics","level":1,"score":0.22503983974456787},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.10871419310569763},{"id":"https://openalex.org/C86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","level":0,"score":0.0},{"id":"https://openalex.org/C78458016","wikidata":"https://www.wikidata.org/wiki/Q840400","display_name":"Evolutionary biology","level":1,"score":0.0}],"mesh":[],"locations_count":2,"locations":[{"id":"doi:10.1007/3-540-62950-5_78","is_oa":false,"landing_page_url":"https://doi.org/10.1007/3-540-62950-5_78","pdf_url":null,"source":{"id":"https://openalex.org/S106296714","display_name":"Lecture notes in computer science","issn_l":"0302-9743","issn":["0302-9743","1611-3349"],"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":"book series"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Lecture Notes in Computer Science","raw_type":"book-chapter"},{"id":"pmh:oai:CiteSeerX.psu:10.1.1.45.7491","is_oa":false,"landing_page_url":"http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.45.7491","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"ftp://ftp.cis.uni-muenchen.de/pub/kepser/ccl/ComplexityCombination.ps.gz","raw_type":"text"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":22,"referenced_works":["https://openalex.org/W28083723","https://openalex.org/W1480465948","https://openalex.org/W1484865830","https://openalex.org/W1512750313","https://openalex.org/W1515595147","https://openalex.org/W1527996124","https://openalex.org/W1602675124","https://openalex.org/W1606769915","https://openalex.org/W1968229471","https://openalex.org/W2011039300","https://openalex.org/W2042924775","https://openalex.org/W2047669821","https://openalex.org/W2055611812","https://openalex.org/W2082354652","https://openalex.org/W2083194346","https://openalex.org/W2113396055","https://openalex.org/W2149257851","https://openalex.org/W2913944636","https://openalex.org/W4285719527","https://openalex.org/W4388298878","https://openalex.org/W6628668608","https://openalex.org/W6630837625"],"related_works":["https://openalex.org/W2367630557","https://openalex.org/W2120204135","https://openalex.org/W101666983","https://openalex.org/W1796293478","https://openalex.org/W2183792531","https://openalex.org/W2595286499","https://openalex.org/W174435416","https://openalex.org/W2168276503","https://openalex.org/W2139396251","https://openalex.org/W1577544887"],"abstract_inverted_index":null,"counts_by_year":[{"year":2017,"cited_by_count":1}],"updated_date":"2026-07-29T14:22:42.915294","created_date":"2025-10-10T00:00:00"}
