{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,6,20]],"date-time":"2025-06-20T20:40:02Z","timestamp":1750452002986,"version":"3.41.0"},"reference-count":1,"publisher":"Cambridge University Press (CUP)","issue":"2","license":[{"start":{"date-parts":[[2004,6,11]],"date-time":"2004-06-11T00:00:00Z","timestamp":1086912000000},"content-version":"unspecified","delay-in-days":71,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Econom. Theory"],"published-print":{"date-parts":[[2004,4]]},"abstract":"<jats:p>Let <jats:italic>P<\/jats:italic> in \n<jats:inline-formula>\n\t      <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" mime-subtype=\"gif\" xlink:href=\"S0266466604222083ffm001.gif\"\/>\n\t    <\/jats:inline-formula> \nbe a projector with <jats:italic>P<\/jats:italic><jats:sup>+<\/jats:sup> its Moore\u2013Penrose inverse \nand <jats:italic>P<\/jats:italic><jats:sup>\n\t      <jats:italic>H<\/jats:italic>\n\t    <\/jats:sup> its conjugate transpose. Werner \n(2002) provides a list of equivalent conditions for \n<jats:italic>P<\/jats:italic> to be Hermitian.<\/jats:p>","DOI":"10.1017\/s0266466604222083","type":"journal-article","created":{"date-parts":[[2008,4,21]],"date-time":"2008-04-21T11:38:33Z","timestamp":1208777913000},"page":"427-427","source":"Crossref","is-referenced-by-count":0,"title":["04.2.2. Characterizations of Hermitian Projectors"],"prefix":"10.1017","volume":"20","author":[{"given":"Geert","family":"Dhaene","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Luc","family":"Lauwers","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"56","published-online":{"date-parts":[[2004,6,11]]},"reference":[{"key":"S0266466604222083_ref001","unstructured":"Werner, H.J. (2002) Partial isometry and idempotent matrices. Solution 28-7.5. IMAGE, The Bulletin of the International Linear Algebra Society 29, 31\u201332."}],"container-title":["Econometric Theory"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.cambridge.org\/core\/services\/aop-cambridge-core\/content\/view\/S0266466604222083","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,6,20]],"date-time":"2025-06-20T20:19:50Z","timestamp":1750450790000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.cambridge.org\/core\/product\/identifier\/S0266466604222083\/type\/journal_article"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2004,4]]},"references-count":1,"journal-issue":{"issue":"2","published-print":{"date-parts":[[2004,12]]}},"alternative-id":["S0266466604222083"],"URL":"https:\/\/doi.org\/10.1017\/s0266466604222083","relation":{},"ISSN":["0266-4666","1469-4360"],"issn-type":[{"type":"print","value":"0266-4666"},{"type":"electronic","value":"1469-4360"}],"subject":[],"published":{"date-parts":[[2004,4]]}}}