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This document contains a history of this page, from the current version to the earliest one available.
| Version | Name | User | Date | Time | |
| current | (obsolete) The problem of derivability | 10.176.200.8 | 22 March 2017 | 9:31 pm | |
| The problem of derivability | h-68-166-66-88.MCLNVA23.dynamic.covad.net | 13 January 2004 | 1:05 pm | ||
| The problem of derivability | h-68-166-66-88.MCLNVA23.dynamic.covad.net | 13 January 2004 | 1:05 pm | ||
| The problem of derivability | h-68-166-66-88.MCLNVA23.dynamic.covad.net | 13 January 2004 | 1:05 pm | ||
| The problem of derivability | h-68-166-66-88.MCLNVA23.dynamic.covad.net | 13 January 2004 | 12:40 pm | ||
| Page 601 - recycle me | pD9E4B04E.dip.t-dialin.net | 31 October 2003 | 12:10 pm | ||
| Swikis | nordstrom.hrz.tu-chemnitz.de | 26 March 2003 | 3:00 pm | ||
| Swikis | c213.200.160.11.cm-upc.chello.se. | 14 October 2000 | 8:27 am | ||
| Swikis | r50h68.res.gatech.edu. | 16 March 1999 | 2:34 pm | ||