{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,17]],"date-time":"2026-04-17T16:56:49Z","timestamp":1776445009860,"version":"3.51.2"},"reference-count":25,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2017,3,15]],"date-time":"2017-03-15T00:00:00Z","timestamp":1489536000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100003170","name":"NKFI","doi-asserted-by":"publisher","award":["K81146"],"award-info":[{"award-number":["K81146"]}],"id":[{"id":"10.13039\/100003170","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100003170","name":"NKFI","doi-asserted-by":"publisher","award":["K119440"],"award-info":[{"award-number":["K119440"]}],"id":[{"id":"10.13039\/100003170","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>Amongst the convex polyhedra with n faces circumscribed about the unit sphere, which has the minimum surface area? This is the isoperimetric problem in discrete geometry which is addressed in this study. The solution of this problem represents the closest approximation of the sphere, i.e., the roundest polyhedra. A new numerical optimization method developed previously by the authors has been applied to optimize polyhedra to best approximate a sphere if tetrahedral, octahedral, or icosahedral symmetry constraints are applied. In addition to evidence provided for various cases of face numbers, potentially optimal polyhedra are also shown for n up to 132.<\/jats:p>","DOI":"10.3390\/sym9030041","type":"journal-article","created":{"date-parts":[[2017,3,15]],"date-time":"2017-03-15T11:39:26Z","timestamp":1489577966000},"page":"41","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["The Roundest Polyhedra with Symmetry Constraints"],"prefix":"10.3390","volume":"9","author":[{"given":"Andr\u00e1s","family":"Lengyel","sequence":"first","affiliation":[{"name":"Department of Structural Mechanics, Budapest University of Technology and Economics, H-1111 Budapest, Hungary"},{"name":"These authors contributed equally to this work."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zsolt","family":"G\u00e1sp\u00e1r","sequence":"additional","affiliation":[{"name":"Department of Structural Mechanics, Budapest University of Technology and Economics, H-1111 Budapest, Hungary"},{"name":"These authors contributed equally to this work."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tibor","family":"Tarnai","sequence":"additional","affiliation":[{"name":"Department of Structural Mechanics, Budapest University of Technology and Economics, H-1111 Budapest, Hungary"},{"name":"These authors contributed equally to this work."}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2017,3,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"41","DOI":"10.1016\/S0012-365X(98)00065-X","article-title":"Fullerenes and coordination polyhedra versus half-cubes embeddings","volume":"192","author":"Deza","year":"1998","journal-title":"Discret. 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