000117654 001__ 117654 000117654 005__ 20220711110510.0 000117654 0247_ $$2doi$$a10.1007/978-3-030-75425-9_11 000117654 0248_ $$2sideral$$a129082 000117654 037__ $$aART-2021-129082 000117654 041__ $$aeng 000117654 100__ $$aGrünbaum, F. A. 000117654 245__ $$aOccupation Time for Classical and Quantum Walks 000117654 260__ $$c2021 000117654 5060_ $$aAccess copy available to the general public$$fUnrestricted 000117654 5203_ $$aThis is a personal tribute to Lance Littlejohn on the occasion of his 70th birthday. It is meant as a present to him for many years of friendship. It is not written in the “Satz-Beweis” style of Edmund Landau or even in the format of a standard mathematics paper. It is rather an invitation to a fairly new, largely unexplored, topic in the hope that Lance will read it some afternoon and enjoy it. If he cares about complete proofs he will have to wait a bit longer; we almost have them but not in time for this volume. We hope that the figures will convince him and other readers that the phenomena displayed here are interesting enough. 000117654 536__ $$9info:eu-repo/grantAgreement/ES/DGA/E48-20R$$9info:eu-repo/grantAgreement/ES/DGA-FEDER/E26-17R$$9info:eu-repo/grantAgreement/ES/MICINN-AEI-FEDER/MTM2017-89941-P 000117654 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/ 000117654 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion 000117654 700__ $$0(orcid)0000-0002-3050-9540$$aVelázquez, L.$$uUniversidad de Zaragoza 000117654 700__ $$aWilkening, J. 000117654 7102_ $$12005$$2595$$aUniversidad de Zaragoza$$bDpto. Matemática Aplicada$$cÁrea Matemática Aplicada 000117654 773__ $$g285 (2021), 197-212$$pOper. theory$$tOperator theory$$x0255-0156 000117654 8564_ $$s1040706$$uhttps://zaguan.unizar.es/record/117654/files/texto_completo.pdf$$yPostprint 000117654 8564_ $$s1202220$$uhttps://zaguan.unizar.es/record/117654/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint 000117654 909CO $$ooai:zaguan.unizar.es:117654$$particulos$$pdriver 000117654 951__ $$a2022-07-11-08:48:30 000117654 980__ $$aARTICLE