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        <identifier>oai:ipsj.ixsq.nii.ac.jp:00032182</identifier>
        <datestamp>2025-01-22T16:17:08Z</datestamp>
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          <dc:title>部分k木に対する辺素な道問題のNP-完全性</dc:title>
          <dc:title xml:lang="en">The Edge - Disjoint Paths Problem is NP - Complete for Partial k - Trees</dc:title>
          <jpcoar:creator>
            <jpcoar:creatorName>周暁</jpcoar:creatorName>
            <jpcoar:creatorName>西関, 隆夫</jpcoar:creatorName>
          </jpcoar:creator>
          <jpcoar:creator>
            <jpcoar:creatorName xml:lang="en">Xiao, Zhou</jpcoar:creatorName>
            <jpcoar:creatorName xml:lang="en">Takao, Nishizeki</jpcoar:creatorName>
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          <datacite:description descriptionType="Other">数多くの組合せ問題は一般のグラフに対してNP?完全であるが，kが定数であるような部分k木に対しては多項式時間で，あるいはほとんどの場合線形時間で解ける．一方，いくつかの問題は部分k木に対してすらNP?完全である.しかしそのような問題は数少く わずかに部分グラフ同形問題と帯域幅（bandwidth）問題等が部分k木に対してNP?完全であることが知られているにすぎない．しかもこれらの問題はk＝1なる部分k木，すなわち通常の木あるいは林に対してすらNP?完全である．このようにk＝1なる部分k木に対しては多項式，時間で解け，2以上で定数の部分k木に対してはNP?完全であるような問題は知られていなかった．本論文は辺素な道問題がそのような一例であることを示す．</datacite:description>
          <datacite:description descriptionType="Other">Many combinatorial problems are NP-complete for general graphs, but are not NP-complete for partial k-trees (graphs of treewidth bounded by a constant k) and can be efficiently solved in polynomial time or mostly in linear time for partial k-trees. On the other hand, very few problems on unweighted graphs are known to be NP-complete for partial k-trees with bounded k. These include the subgraph isomorphism problem and the bandwidth problem. However, all these problems are NP-complete even for ordinary trees or forests, and there have been no known problems which are efficiently solvable for trees but NP-complete for partial k-trees. In this paper we present the first example of such problems, that is ,we show that the edge-disjoint paths problem is NP-complete for partial k-trees with some bounded k〓2 although the problem is trivially solvable for trees.</datacite:description>
          <dc:publisher xml:lang="ja">情報処理学会</dc:publisher>
          <datacite:date dateType="Issued">1998-05-20</datacite:date>
          <dc:language>jpn</dc:language>
          <dc:type rdf:resource="http://purl.org/coar/resource_type/c_18gh">technical report</dc:type>
          <jpcoar:identifier identifierType="URI">https://ipsj.ixsq.nii.ac.jp/records/32182</jpcoar:identifier>
          <jpcoar:sourceIdentifier identifierType="NCID">AN1009593X</jpcoar:sourceIdentifier>
          <jpcoar:sourceTitle>情報処理学会研究報告アルゴリズム（AL）</jpcoar:sourceTitle>
          <jpcoar:volume>1998</jpcoar:volume>
          <jpcoar:issue>41(1998-AL-062)</jpcoar:issue>
          <jpcoar:pageStart>25</jpcoar:pageStart>
          <jpcoar:pageEnd>32</jpcoar:pageEnd>
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            <datacite:date dateType="Available">2000-05-20</datacite:date>
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