| Fri, 10 May 2019 11:56:37 +0100 | Christian Urban | updated | file | diff | annotate |
| Mon, 11 Feb 2019 14:36:23 +0000 | Christian Urban | added partial derivative proof from Antimirov | file | diff | annotate |
| Sun, 10 Feb 2019 21:53:57 +0000 | Christian Urban | updated to Isabelle 2018 | file | diff | annotate |