| Mon, 24 May 2010 20:02:11 +0100 | Christian Urban | added phi for morphisms | file | diff | annotate |
| Sat, 24 Apr 2010 22:55:50 +0200 | Christian Urban | added a section to the introduction; described @{make_string} | file | diff | annotate |
| Thu, 11 Feb 2010 10:44:50 +0100 | Christian Urban | typos fixed by Michael Norrish | file | diff | annotate |