(2+2)-free posets, ascent sequences and pattern avoiding permutations · HackerPapers discussionshttps://hackerpaper.kaipfister.de/p/0806.0666/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMT(2+2)-free posets, ascent sequences and pattern avoiding permutations — mentioned by mrcactu5https://news.ycombinator.com/item?id=12832091urn:hackerpapers:mention:0806.0666:12832091Sun, 30 Oct 2016 20:35:03 GMT<p>beautiful ASCII visualization! In theory class we called it &quot;interval arithmetic&quot; https://en.wikipedia.org/wiki/Interval_arithmetic (2+2)-free posets, ascent sequences and pattern avoiding permutations https://arxiv.org/abs/0806.0666</p><p><a href="https://hackerpaper.kaipfister.de/p/0806.0666/">Paper and discussion history</a>. A mention is not an endorsement.</p>math.CO