Media type: E-Article Title: Correspondence Contributor: Pla, Juan Published: Cambridge University Press (CUP), 2010 Published in: The Mathematical Gazette, 94 (2010) 531, Seite 536-536 Language: English DOI: 10.1017/s0025557200001959 ISSN: 0025-5572; 2056-6328 Keywords: General Mathematics Origination: Footnote: