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<a href="/authors/hannah.robert" title="Author Profile">Hannah, Robert</a><a class="btn btn-default btn-xs matrix" type="button" href="https://donald.zentralblatt-math.org/lethe/recruit/?first_name=Robert&amp;last_name=Hannah&amp;document_id=7550212"> <span class="text-danger">Recruit</span> </a>; <a href="/authors/yin.wotao" title="Author Profile">Yin, Wotao</a><a class="btn btn-default btn-xs matrix" type="button" href="https://donald.zentralblatt-math.org/lethe/recruit/?first_name=Wotao&amp;last_name=Yin&amp;document_id=7550212"> <span class="text-danger">Recruit</span> </a></div> <h2 class="title"> <strong>Scaled relative graphs: nonexpansive operators via 2D Euclidean geometry.</strong> <i>(English)</i> <a class="label nowrap" href="/1543.47129">Zbl 1543.47129</a> </h2> <div class="source"> <a href="/serials/1746" title="Journal Profile">Math. Program.</a> <a href="/?q=in%3A483696" title="Articles in this Issue">194, No. 1-2 (A), 569-619 (2022)</a>. </div> <div class="abstract"><div class="pre">Summary: Many iterative methods in applied mathematics can be thought of as fixed-point iterations, and such algorithms are usually analyzed analytically, with inequalities. In this paper, we present a geometric approach to analyzing contractive and nonexpansive fixed point iterations with a new tool called the scaled relative graph. The SRG provides a correspondence between nonlinear operators and subsets of the 2D plane. Under this framework, a geometric argument in the 2D plane becomes a rigorous proof of convergence.</div></div> <div class="clear"></div> <br> <div class="citations"><div class="clear"><a href="/?q=rf%3A7550212">Cited in <strong>4</strong> Documents</a></div></div> <div class="classification"> <h3>MSC:</h3> <table><tr> <td> <a class="mono" href="/classification/?q=cc%3A47J26" title="MSC2020">47J26</a> </td> <td class="space"> Fixed-point iterations </td> </tr><tr> <td> <a class="mono" href="/classification/?q=cc%3A47H05" title="MSC2020">47H05</a> </td> <td class="space"> Monotone operators and generalizations </td> </tr><tr> <td> <a class="mono" href="/classification/?q=cc%3A47H09" title="MSC2020">47H09</a> </td> <td class="space"> Contraction-type mappings, nonexpansive mappings, \(A\)-proper mappings, etc. </td> </tr><tr> <td> <a class="mono" href="/classification/?q=cc%3A51M04" title="MSC2020">51M04</a> </td> <td class="space"> Elementary problems in Euclidean geometries </td> </tr><tr> <td> <a class="mono" href="/classification/?q=cc%3A90C25" title="MSC2020">90C25</a> </td> <td class="space"> Convex programming </td> </tr><tr> <td> <a class="mono" href="/classification/?q=cc%3A49M27" title="MSC2020">49M27</a> </td> <td class="space"> Decomposition methods </td> </tr></table> </div><div class="keywords"> <h3>Keywords:</h3><a href="/?q=ut%3Afixed-point+iteration">fixed-point iteration</a>; <a href="/?q=ut%3AEuclidean+geometry">Euclidean geometry</a>; <a href="/?q=ut%3Ainversive+geometry">inversive geometry</a>; <a href="/?q=ut%3Acontraction+mapping">contraction mapping</a>; <a href="/?q=ut%3ADouglas-Rachford+splitting">Douglas-Rachford splitting</a>; <a href="/?q=ut%3Ametric+subregularity">metric subregularity</a>; <a href="/?q=ut%3Amonotone+operator">monotone operator</a></div> <div class="software"> <h3>Software:</h3><a href="/software/7020">Eigtool</a>; <a href="/software/20864">PESTO</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">&times;</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 1543.47129" data-ciurl="/ci/07550212" data-biburl="/bibtex/07550212.bib" data-amsurl="/amsrefs/07550212.bib" data-xmlurl="/xml/07550212.xml" > Cite </a> <a class="btn btn-default btn-xs pdf" data-container="body" type="button" href="/pdf/07550212.pdf" title="Zbl 1543.47129 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/10.1007/s10107-021-01639-w" aria-label="DOI for “Scaled relative graphs: nonexpansive operators via 2D Euclidean geometry”" title="10.1007/s10107-021-01639-w">DOI</a> <a class="btn btn-default btn-xs" type="button" href="https://arxiv.org/abs/1902.09788" title="Note: arXiv document may differ from published version">arXiv</a> </div> <div class="sfx" style="float: right;"> </div> </div> <div class="references"> <h3>References:</h3> <table><tr> <td>[1]</td> <td class="space">Ablowitz, MJ; Fokas, AS, Complex Variables: Introduction and Applications (2003), Cambridge: Cambridge University Press, Cambridge &middot; <a href="/1088.30001" class="nowrap">Zbl 1088.30001</a></td> </tr><tr> <td>[2]</td> <td class="space">Abramowitz, M.; Stegun, IA, Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables (1964), New York: Dover, New York &middot; <a href="/0171.38503" class="nowrap">Zbl 0171.38503</a></td> </tr><tr> <td>[3]</td> <td class="space">Banach, S., Sur les opérations dans les ensembles abstraits et leur application aux équations intégrales, Fundam. Math., 3, 1, 133-181 (1922) &middot; <a href="/48.0201.01" class="nowrap">JFM 48.0201.01</a></td> </tr><tr> <td>[4]</td> <td class="space">Banjac, G.; Goulart, PJ, Tight global linear convergence rate bounds for operator splitting methods, IEEE Trans. Autom. Control, 63, 12, 4126-4139 (2018) &middot; <a href="/1423.90175" class="nowrap">Zbl 1423.90175</a></td> </tr><tr> <td>[5]</td> <td class="space">Bauschke, HH; Combettes, PL, Convex Analysis and Monotone Operator Theory in Hilbert Spaces (2017), Berlin: Springer, Berlin &middot; <a href="/1359.26003" class="nowrap">Zbl 1359.26003</a></td> </tr><tr> <td>[6]</td> <td class="space">Bauschke, HH; Noll, D.; Phan, HM, Linear and strong convergence of algorithms involving averaged nonexpansive operators, J. Math. Anal. Appl., 421, 1, 1-20 (2015) &middot; <a href="/1297.65060" class="nowrap">Zbl 1297.65060</a></td> </tr><tr> <td>[7]</td> <td class="space">Bauschke, H.H., Wang, X.: Firmly nonexpansive and Kirszbraun-Valentine extensions: a constructive approach via monotone operator theory. In: Nonlinear Analysis and Optimization I: Nonlinear Analysis, pp. 55-64. American Mathematics Society (2010) &middot; <a href="/1247.47028" class="nowrap">Zbl 1247.47028</a></td> </tr><tr> <td>[8]</td> <td class="space">Bauschke, H.H., Wang, X., Yao, L.: General resolvents for monotone operators: characterization and extension. In: Biomedical Mathematics: Promising Directions in Imaging, Therapy Planning, and Inverse Problems, pp. 57-74. Medical Physics Publishing (2010)</td> </tr><tr> <td>[9]</td> <td class="space">Beck, A., First-Order Methods in Optimization (2017), Philadelphia: Society for Industrial and Applied Mathematics, Philadelphia &middot; <a href="/1384.65033" class="nowrap">Zbl 1384.65033</a></td> </tr><tr> <td>[10]</td> <td class="space">Bellman, R., On the theory of dynamic programming, Proc. Natl. Acad. Sci., 38, 8, 716-719 (1952) &middot; <a href="/0047.13802" class="nowrap">Zbl 0047.13802</a></td> </tr><tr> <td>[11]</td> <td class="space">Bolte, J.; Nguyen, TP; Peypouquet, J.; Suter, BW, From error bounds to the complexity of first-order descent methods for convex functions, Math. Program., 165, 2, 471-507 (2017) &middot; <a href="/1373.90076" class="nowrap">Zbl 1373.90076</a></td> </tr><tr> <td>[12]</td> <td class="space">Boyd, S.; Vandenberghe, L., Convex Optimization (2004), Cambridge: Cambridge University Press, Cambridge &middot; <a href="/1058.90049" class="nowrap">Zbl 1058.90049</a></td> </tr><tr> <td>[13]</td> <td class="space">Brezis, H.; Lions, PL, Produits infinis de resolvantes, Israel J. Math., 29, 4, 329-345 (1978) &middot; <a href="/0387.47038" class="nowrap">Zbl 0387.47038</a></td> </tr><tr> <td>[14]</td> <td class="space">Briceño-Arias, LM; Davis, D., Forward-backward-half forward algorithm for solving monotone inclusions, SIAM J. Optim., 28, 4, 2839-2871 (2018) &middot; <a href="/06951769" class="nowrap">Zbl 06951769</a></td> </tr><tr> <td>[15]</td> <td class="space">Bruck, RE, On the weak convergence of an ergodic iteration for the solution of variational inequalities for monotone operators in hilbert space, J. Math. Anal. 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