| Wed, 06 May 2020 10:46:19 +0200 | nipkow | tuned | file | diff | annotate |
| Tue, 28 Apr 2020 18:34:59 +0200 | nipkow | use abs(h l - h r) instead of 3 cases, tuned proofs | file | diff | annotate |
| Wed, 01 Apr 2020 21:48:39 +0200 | nipkow | simplified code and proofs | file | diff | annotate |