Parts, Jaan The chromatic number of the plane is at least 5 – a human-veriviable proof. (English) Zbl 1455.05020 Geombinatorics 30, No. 2, 77-102 (2020). MSC: 05C15 PDFBibTeX XMLCite \textit{J. Parts}, Geombinatorics 30, No. 2, 77--102 (2020; Zbl 1455.05020) Full Text: arXiv
Malen, Greg; Roldán, Érika Polyiamonds attaining extremal topological properties. II. (English) Zbl 1460.52023 Geombinatorics 30, No. 2, 63-76 (2020). Reviewer: Christian Richter (Jena) MSC: 52C45 05A15 05D99 52B05 52B60 52C05 57M15 PDFBibTeX XMLCite \textit{G. Malen} and \textit{É. Roldán}, Geombinatorics 30, No. 2, 63--76 (2020; Zbl 1460.52023) Full Text: arXiv
Soifer, Alexander Remembering Ronald Lewis Graham (October 31, 1935 – July 6, 2020). (English) Zbl 1452.01049 Geombinatorics 30, No. 2, 56-62 (2020). MSC: 01A70 PDFBibTeX XMLCite \textit{A. Soifer}, Geombinatorics 30, No. 2, 56--62 (2020; Zbl 1452.01049)
Soifer, Alexander Remembering John Horton Conway (26 December 1937 – 11 April 2020). (English) Zbl 1452.01048 Geombinatorics 30, No. 2, 53-55 (2020). MSC: 01A70 PDFBibTeX XMLCite \textit{A. Soifer}, Geombinatorics 30, No. 2, 53--55 (2020; Zbl 1452.01048)