{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,13]],"date-time":"2026-05-13T07:49:20Z","timestamp":1778658560806,"version":"3.51.4"},"reference-count":30,"publisher":"Springer Science and Business Media LLC","issue":"2","license":[{"start":{"date-parts":[[2023,10,28]],"date-time":"2023-10-28T00:00:00Z","timestamp":1698451200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2023,10,28]],"date-time":"2023-10-28T00:00:00Z","timestamp":1698451200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100007837","name":"Universit\u00e4t Bremen","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100007837","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Algorithmica"],"published-print":{"date-parts":[[2024,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>In the <jats:sc>Token Sliding<\/jats:sc> problem we are given a graph <jats:italic>G<\/jats:italic> and two independent sets <jats:inline-formula><jats:alternatives><jats:tex-math>$$I_s$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:msub>\n                    <mml:mi>I<\/mml:mi>\n                    <mml:mi>s<\/mml:mi>\n                  <\/mml:msub>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> and <jats:inline-formula><jats:alternatives><jats:tex-math>$$I_t$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:msub>\n                    <mml:mi>I<\/mml:mi>\n                    <mml:mi>t<\/mml:mi>\n                  <\/mml:msub>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> in <jats:italic>G<\/jats:italic> of size <jats:inline-formula><jats:alternatives><jats:tex-math>$$k \\ge 1$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mrow>\n                    <mml:mi>k<\/mml:mi>\n                    <mml:mo>\u2265<\/mml:mo>\n                    <mml:mn>1<\/mml:mn>\n                  <\/mml:mrow>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula>. The goal is to decide whether there exists a sequence <jats:inline-formula><jats:alternatives><jats:tex-math>$$\\langle I_1, I_2, \\ldots , I_\\ell \\rangle $$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mrow>\n                    <mml:mo>\u27e8<\/mml:mo>\n                    <mml:msub>\n                      <mml:mi>I<\/mml:mi>\n                      <mml:mn>1<\/mml:mn>\n                    <\/mml:msub>\n                    <mml:mo>,<\/mml:mo>\n                    <mml:msub>\n                      <mml:mi>I<\/mml:mi>\n                      <mml:mn>2<\/mml:mn>\n                    <\/mml:msub>\n                    <mml:mo>,<\/mml:mo>\n                    <mml:mo>\u2026<\/mml:mo>\n                    <mml:mo>,<\/mml:mo>\n                    <mml:msub>\n                      <mml:mi>I<\/mml:mi>\n                      <mml:mi>\u2113<\/mml:mi>\n                    <\/mml:msub>\n                    <mml:mo>\u27e9<\/mml:mo>\n                  <\/mml:mrow>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> of independent sets such that for all <jats:inline-formula><jats:alternatives><jats:tex-math>$$j \\in \\{1,\\ldots , \\ell - 1\\}$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mrow>\n                    <mml:mi>j<\/mml:mi>\n                    <mml:mo>\u2208<\/mml:mo>\n                    <mml:mo>{<\/mml:mo>\n                    <mml:mn>1<\/mml:mn>\n                    <mml:mo>,<\/mml:mo>\n                    <mml:mo>\u2026<\/mml:mo>\n                    <mml:mo>,<\/mml:mo>\n                    <mml:mi>\u2113<\/mml:mi>\n                    <mml:mo>-<\/mml:mo>\n                    <mml:mn>1<\/mml:mn>\n                    <mml:mo>}<\/mml:mo>\n                  <\/mml:mrow>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> the set <jats:inline-formula><jats:alternatives><jats:tex-math>$$I_j$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:msub>\n                    <mml:mi>I<\/mml:mi>\n                    <mml:mi>j<\/mml:mi>\n                  <\/mml:msub>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> is an independent set of size\u00a0<jats:italic>k<\/jats:italic>, <jats:inline-formula><jats:alternatives><jats:tex-math>$$I_1 = I_s$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mrow>\n                    <mml:msub>\n                      <mml:mi>I<\/mml:mi>\n                      <mml:mn>1<\/mml:mn>\n                    <\/mml:msub>\n                    <mml:mo>=<\/mml:mo>\n                    <mml:msub>\n                      <mml:mi>I<\/mml:mi>\n                      <mml:mi>s<\/mml:mi>\n                    <\/mml:msub>\n                  <\/mml:mrow>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula>, <jats:inline-formula><jats:alternatives><jats:tex-math>$$I_\\ell = I_t$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mrow>\n                    <mml:msub>\n                      <mml:mi>I<\/mml:mi>\n                      <mml:mi>\u2113<\/mml:mi>\n                    <\/mml:msub>\n                    <mml:mo>=<\/mml:mo>\n                    <mml:msub>\n                      <mml:mi>I<\/mml:mi>\n                      <mml:mi>t<\/mml:mi>\n                    <\/mml:msub>\n                  <\/mml:mrow>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> and <jats:inline-formula><jats:alternatives><jats:tex-math>$$I_j \\triangle I_{j + 1} = \\{u, v\\} \\in E(G)$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mrow>\n                    <mml:msub>\n                      <mml:mi>I<\/mml:mi>\n                      <mml:mi>j<\/mml:mi>\n                    <\/mml:msub>\n                    <mml:mi>\u25b5<\/mml:mi>\n                    <mml:msub>\n                      <mml:mi>I<\/mml:mi>\n                      <mml:mrow>\n                        <mml:mi>j<\/mml:mi>\n                        <mml:mo>+<\/mml:mo>\n                        <mml:mn>1<\/mml:mn>\n                      <\/mml:mrow>\n                    <\/mml:msub>\n                    <mml:mo>=<\/mml:mo>\n                    <mml:mrow>\n                      <mml:mo>{<\/mml:mo>\n                      <mml:mi>u<\/mml:mi>\n                      <mml:mo>,<\/mml:mo>\n                      <mml:mi>v<\/mml:mi>\n                      <mml:mo>}<\/mml:mo>\n                    <\/mml:mrow>\n                    <mml:mo>\u2208<\/mml:mo>\n                    <mml:mi>E<\/mml:mi>\n                    <mml:mrow>\n                      <mml:mo>(<\/mml:mo>\n                      <mml:mi>G<\/mml:mi>\n                      <mml:mo>)<\/mml:mo>\n                    <\/mml:mrow>\n                  <\/mml:mrow>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula>. Intuitively, we view each independent set as a collection of tokens placed on the vertices of the graph. Then, the problem asks whether there exists a sequence of independent sets that transforms <jats:inline-formula><jats:alternatives><jats:tex-math>$$I_s$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:msub>\n                    <mml:mi>I<\/mml:mi>\n                    <mml:mi>s<\/mml:mi>\n                  <\/mml:msub>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> into <jats:inline-formula><jats:alternatives><jats:tex-math>$$I_t$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:msub>\n                    <mml:mi>I<\/mml:mi>\n                    <mml:mi>t<\/mml:mi>\n                  <\/mml:msub>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> where at each step we are allowed to slide one token from a vertex to a neighboring vertex. In this paper, we focus on the parameterized complexity of <jats:sc>Token Sliding<\/jats:sc> parameterized by <jats:italic>k<\/jats:italic>. As shown by Bartier et al.\u00a0(Algorithmica 83(9):2914\u20132951, 2021. <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"doi\" xlink:href=\"10.1007\/s00453-021-00848-1\">https:\/\/doi.org\/10.1007\/s00453-021-00848-1<\/jats:ext-link>), the problem is -hard on graphs of girth four or less, and the authors posed the question of whether there exists a constant <jats:inline-formula><jats:alternatives><jats:tex-math>$$p \\ge 5$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mrow>\n                    <mml:mi>p<\/mml:mi>\n                    <mml:mo>\u2265<\/mml:mo>\n                    <mml:mn>5<\/mml:mn>\n                  <\/mml:mrow>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> such that the problem becomes fixed-parameter tractable on graphs of girth at least <jats:italic>p<\/jats:italic>. We answer their question positively and prove that the problem is indeed fixed-parameter tractable on graphs of girth five or more, which establishes a full classification of the tractability of <jats:sc>Token Sliding<\/jats:sc> parameterized by the number of tokens based on the girth of the input graph.<\/jats:p>","DOI":"10.1007\/s00453-023-01181-5","type":"journal-article","created":{"date-parts":[[2023,10,28]],"date-time":"2023-10-28T12:01:44Z","timestamp":1698494504000},"page":"638-655","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Token Sliding on Graphs of Girth Five"],"prefix":"10.1007","volume":"86","author":[{"given":"Valentin","family":"Bartier","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nicolas","family":"Bousquet","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jihad","family":"Hanna","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Amer E.","family":"Mouawad","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sebastian","family":"Siebertz","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2023,10,28]]},"reference":[{"key":"1181_CR1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1016\/j.tcs.2016.05.015","volume":"639","author":"RC Brewster","year":"2016","unstructured":"Brewster, R.C., McGuinness, S., Moore, B., Noel, J.A.: A dichotomy theorem for circular colouring reconfiguration. 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