| Fri, 18 Sep 2020 12:33:10 +0200 | nipkow | tuned | file | diff | annotate |
| Tue, 15 Sep 2020 08:57:47 +0200 | nipkow | added lemma | file | diff | annotate |
| Wed, 25 Sep 2019 17:22:57 +0200 | nipkow | replaced new type ('a,'b) tree by old type ('a*'b) tree. | file | diff | annotate |