| Tue, 11 Sep 2018 22:25:00 +0200 | nipkow | tuned proof | file | diff | annotate |
| Tue, 11 Sep 2018 18:12:11 +0200 | nipkow | simplified defns | file | diff | annotate |
| Tue, 11 Sep 2018 17:53:08 +0200 | nipkow | "undefined" not needed, [] is perfectly natural | file | diff | annotate |