{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T04:31:11Z","timestamp":1760243471523,"version":"build-2065373602"},"reference-count":36,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2013,6,17]],"date-time":"2013-06-17T00:00:00Z","timestamp":1371427200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Entropy"],"abstract":"<jats:p>A subject of interest in classical and quantum mechanics is the development of the appropriate treatment of the time variable. In this paper we introduce a method of choosing the initial time eigensurface and how this method can be used to generate time-energy coordinates and, consequently, time-energy representations for classical and quantum systems.<\/jats:p>","DOI":"10.3390\/e15062415","type":"journal-article","created":{"date-parts":[[2013,6,17]],"date-time":"2013-06-17T11:18:49Z","timestamp":1371467929000},"page":"2415-2430","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["A Method for Choosing an Initial Time Eigenstate in Classical and Quantum Systems"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3122-0546","authenticated-orcid":false,"given":"Gabino","family":"Torres-Vega","sequence":"first","affiliation":[{"name":"Physics Department, Cinvestav, Apdo. postal 14-740, M\u00e8xico, DF 07300 , Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M\u00f3nica","family":"Jim\u00e9nez-Garc\u00eda","sequence":"additional","affiliation":[{"name":"Physics Department, Cinvestav, Apdo. postal 14-740, M\u00e8xico, DF 07300 , Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2013,6,17]]},"reference":[{"unstructured":"Da Silva, A.C. 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