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Inanç</a>; <a href="/authors/hayano.kenta" title="Author Profile">Hayano, Kenta</a></div> <h2 class="title"> <strong>Multisections of Lefschetz fibrations and topology of symplectic 4-manifolds.</strong> <i>(English)</i> <a class="label nowrap" href="/1371.57014">Zbl 1371.57014</a> </h2> <div class="source"> <a href="/serials/2395" title="Journal Profile">Geom. Topol.</a> <a href="/?q=in%3A358921" title="Articles in this Issue">20, No. 4, 2335-2395 (2016)</a>. </div> <div class="abstract">The authors describe a method by which the monodromy representation of a Lefschetz fibration can be lifted from the mapping class group to the framed mapping class group. The framed mapping class group is a natural extension of the mapping class group ideally suited to handle multisections, in contrast to disjoint sections. The relations thus obtained in the framed mapping class group are directly related to the existence of positive multisections of the Lefschetz fibration, see Theorem 3.6. Section 3 details this relationship and proves the key Theorem 3.6. Theoretically this builds a link between the combinatorial methods in mapping class groups and symplectic surfaces in symplectic 4-manifolds, in much the same fashion (and forming an extension of) the relationship between the mapping class group and symplectic 4-manifolds. Of particular interest are of course special surfaces such as exceptional curves, basic classes, etc.<br class="zbmathjax-paragraph">Sections 4-7 contain numerous applications of this theory. Section 4 concentrates on symplectic Kodaira dimension 0 manifolds and constructs examples homeomorphic to K3 and Enriques surfaces. It is as yet unclear if they are diffeomorphic, see Question 4.8. In Section 5 Lefschetz fibrations are constructed which are counterexamples to a conjecture of Stipsicz, see Theorem 1.3; while not the first examples they are the first systematic such constructions. Section 6 contains the construction of non-isomorphic Lefschetz fibrations of arbitrarily large fiber genus. Finally, in Section 7 further interesting examples of Lefschetz pencils having the same topology but which are non-diffeomorphic are constructed.<div class="reviewer"> Reviewer: <a href="/authors/?q=rv%3A15805">Josef G. Dorfmeister (Fargo)</a></div> <div class="clearfix"></div></div> <div class="clear"></div> <br> <div class="citations"><div class="clear"><a href="/?q=ci%3A6628605">Cited in <strong>1</strong> Review</a></div><div class="clear"><a href="/?q=rf%3A6628605">Cited in <strong>13</strong> Documents</a></div></div> <div class="classification"> <h3>MSC:</h3> <table><tr> <td> <a class="mono" href="/classification/?q=cc%3A57M50" title="MSC2020">57M50</a> </td> <td class="space"> General geometric structures on low-dimensional manifolds </td> </tr><tr> <td> <a class="mono" href="/classification/?q=cc%3A57R17" title="MSC2020">57R17</a> </td> <td class="space"> Symplectic and contact topology in high or arbitrary dimension </td> </tr><tr> <td> <a class="mono" href="/classification/?q=cc%3A57R55" title="MSC2020">57R55</a> </td> <td class="space"> Differentiable structures in differential topology </td> </tr><tr> <td> <a class="mono" href="/classification/?q=cc%3A53D35" title="MSC2020">53D35</a> </td> <td class="space"> Global theory of symplectic and contact manifolds </td> </tr><tr> <td> <a class="mono" href="/classification/?q=cc%3A20F65" title="MSC2020">20F65</a> </td> <td class="space"> Geometric group theory </td> </tr><tr> <td> <a class="mono" href="/classification/?q=cc%3A57R22" title="MSC2020">57R22</a> </td> <td class="space"> Topology of vector bundles and fiber bundles </td> </tr></table> </div><div class="keywords"> <h3>Keywords:</h3><a href="/?q=ut%3Asymplectic+4-manifolds">symplectic 4-manifolds</a>; <a href="/?q=ut%3ALefschetz+fibrations">Lefschetz fibrations</a>; <a href="/?q=ut%3Amapping+class+group">mapping class group</a>; <a href="/?q=ut%3Amultisections">multisections</a></div> <!-- Modal used to show zbmath metadata in different output formats--> <div class="modal fade" id="metadataModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel"> <div class="modal-dialog" role="document"> <div class="modal-content"> <div class="modal-header"> <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button> <h4 class="modal-title" id="myModalLabel">Cite</h4> </div> <div class="modal-body"> <div class="form-group"> <label for="select-output" class="control-label">Format</label> <select id="select-output" class="form-control" aria-label="Select Metadata format"></select> </div> <div class="form-group"> <label for="metadataText" class="control-label">Result</label> <textarea class="form-control" id="metadataText" rows="10" style="min-width: 100%;max-width: 100%"></textarea> </div> <div id="metadata-alert" class="alert alert-danger" role="alert" style="display: none;"> <!-- alert for connection errors etc --> </div> </div> <div class="modal-footer"> <button type="button" class="btn btn-primary" onclick="copyMetadata()">Copy to clipboard</button> <button type="button" class="btn btn-default" data-dismiss="modal">Close</button> </div> </div> </div> </div> <div class="functions clearfix"> <div class="function"> <!-- Button trigger metadata modal --> <a type="button" class="btn btn-default btn-xs pdf" data-toggle="modal" data-target="#metadataModal" data-itemtype="Zbl" data-itemname="Zbl 1371.57014" data-ciurl="/ci/06628605" data-biburl="/bibtex/06628605.bib" data-amsurl="/amsrefs/06628605.bib" data-xmlurl="/xml/06628605.xml" > Cite </a> <a class="btn btn-default btn-xs pdf" data-container="body" type="button" href="/pdf/06628605.pdf" title="Zbl 1371.57014 as PDF">Review PDF</a> </div> <div class="fulltexts"> <span class="fulltext">Full Text:</span> <a class="btn btn-default btn-xs" type="button" href="https://doi.org/10.2140/gt.2016.20.2335" aria-label="DOI for “Multisections of Lefschetz fibrations and topology of symplectic 4-manifolds”" title="10.2140/gt.2016.20.2335">DOI</a> <a class="btn btn-default btn-xs" type="button" href="https://arxiv.org/abs/1309.2667"title="Note: arXiv document may differ from published version">arXiv</a> </div> <div class="sfx" style="float: right;"> </div> </div> </article> </div></div> </div> </div> <div class="clearfix"></div> </div> </div> <div id="foot"><div class="copyright"> © 2025 <a target="fiz" href="https://www.fiz-karlsruhe.de/en">FIZ Karlsruhe GmbH</a> <a href="/privacy-policy/">Privacy Policy</a> <a href="/legal-notices/">Legal Notices</a> <a href="/terms-conditions/">Terms & Conditions</a> <div class="info"> <ul class="nav"> <li class="mastodon"> <a href="https://mathstodon.xyz/@zbMATH" target="_blank" class="no-new-tab-icon"> <img src="/static/mastodon.png" title="zbMATH at Mathstodon (opens in new tab)" alt="Mastodon logo"> </a> </li> </ul> </div> </div> <div class="clearfix" style="height: 0px;"></div> </div> </div> <script src="https://static.zbmath.org/contrib/jquery/1.9.1/jquery.min.js"></script> <script src="https://static.zbmath.org/contrib/jquery-caret/1.5.2/jquery.caret.min.js"></script> <script src="/static/js/jquery-ui-1.10.1.custom.min.js"></script> <script src="https://static.zbmath.org/contrib/bootstrap/v3.3.7zb1/js/bootstrap.min.js"></script> <script src="https://static.zbmath.org/contrib/bootstrap-lightbox/v0.7.0/bootstrap-lightbox.min.js"></script> <script src="https://static.zbmath.org/contrib/retina/unknown/retina.js"></script> <script src="https://static.zbmath.org/contrib/bootstrap-select/v1.13.14/js/bootstrap-select.min.js"></script> <script> var SCRIPT_ROOT = ""; 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