| Mon, 19 Feb 2018 10:05:37 +0100 | wenzelm | more operations; | changeset | files |
| Mon, 19 Feb 2018 13:56:16 +0100 | nipkow | added lemma | changeset | files |
| Sun, 18 Feb 2018 20:08:21 +0100 | wenzelm | tuned; | changeset | files |
| Sun, 18 Feb 2018 19:49:01 +0100 | wenzelm | clarified signature; | changeset | files |