1. Gallai–Ramsey Numbers for a Class of Graphs with Five Vertices

   • Xihe Li
   • Ligong Wang

   Original Paper 02 June 2020 Pages: 1603 - 1618

   

2. Correction to: Gallai–Ramsey Numbers for a Class of Graphs with Five Vertices

   • Xihe Li
   • Ligong Wang

   Correction 03 October 2020 Pages: 1619 - 1622

3. On Colorful Edge Triples in Edge-Colored Complete Graphs

   • Gábor Simonyi

   Original Paper Open access 09 September 2020 Pages: 1623 - 1637

4. Bipartite Independent Number and Hamilton-Biconnectedness of Bipartite Graphs

   • Binlong Li

   Original Paper 15 September 2020 Pages: 1639 - 1653

   

5. On 0-Rotatable Graceful Caterpillars

   • Atílio G. Luiz
   • C. N. Campos
   • R. Bruce Richter

   Original Paper 03 September 2020 Pages: 1655 - 1673

   

6. Sub-Ramsey Numbers for Matchings

   • Fangfang Wu
   • Shenggui Zhang
   • Binlong Li

   Original Paper 24 July 2020 Pages: 1675 - 1685

   

7. Group Divisible Designs with Block Size Four and Type \(g^u b^1 (gu/2)^1\)

   • Anthony D. Forbes

   Original Paper 23 July 2020 Pages: 1687 - 1703

8. A Note on Combinatorial Proofs for Extended Touchard’s and Extended Koshy’s Identities

   • Roberta R. Zhou
   • Kun Yan
   • Xinxin Xu

   Original Paper 04 June 2020 Pages: 1705 - 1711

   

9. There Are No Cubic Graphs on 26 Vertices with Crossing Number 10 or 11

   • Kieran Clancy
   • Michael Haythorpe
   • Ed Pegg Jr

   Original Paper 28 June 2020 Pages: 1713 - 1721

   

10. Partitioning Claw-Free Subcubic Graphs into Two Dominating Sets

    • Qing Cui

    Original Paper 08 June 2020 Pages: 1723 - 1740

    

11. The Triangle Groups (2, 4, 5) and (2, 5, 5) are not Systolic

    • Annette Karrer
    • Petra Schwer
    • Koen Struyve

    Original Paper Open access 09 August 2020 Pages: 1741 - 1782

    

12. Two-Coloring Triples such that in Each Color Class Every Element is Missed at Least Once

    • Balázs Keszegh

    Original Paper Open access 06 August 2020 Pages: 1783 - 1795

13. Spanning Triangle-Trees and Flows of Graphs

    • Jiaao Li
    • Xueliang Li
    • Meiling Wang

    Original Paper 13 August 2020 Pages: 1797 - 1814

    

14. Reconfiguring 10-Colourings of Planar Graphs

    • Carl Feghali

    Original Paper 30 May 2020 Pages: 1815 - 1818

15. Uniform Length Dominating Sequence Graphs

    • Aysel Erey

    Original Paper 12 August 2020 Pages: 1819 - 1825

16. Extremal Graphs for Blow-Ups of Keyrings

    • Zhenyu Ni
    • Liying Kang
    • Hui Zhu

    Original Paper 01 July 2020 Pages: 1827 - 1853

    

17. Multi-color Forcing in Graphs

    • Chassidy Bozeman
    • Pamela E. Harris
    • Teresa Yu

    Original Paper 13 June 2020 Pages: 1855 - 1868

    

18. Decomposing Degenerate Graphs into Locally Irregular Subgraphs

    • Julien Bensmail
    • François Dross
    • Nicolas Nisse

    Original Paper 23 May 2020 Pages: 1869 - 1889

    

19. Separability of Schur Rings Over Abelian Groups of Odd Order

    • Grigory Ryabov

    Original Paper 09 July 2020 Pages: 1891 - 1911

20. \(P_{3}\)-Factors in the Square of a Tree

    • Guowei Dai
    • Zhiquan Hu

    Original Paper 04 August 2020 Pages: 1913 - 1925

    

21. On Degree Sum Conditions and Vertex-Disjoint Chorded Cycles

    • Bradley Elliott
    • Ronald J. Gould
    • Kazuhide Hirohata

    Original Paper 21 September 2020 Pages: 1927 - 1945

    

22. Ear-Slicing for Matchings in Hypergraphs

    • András Sebő

    Original Paper 02 September 2020 Pages: 1947 - 1951

23. A Combinatorial Proof of Fisher’s Inequality

    • Rogers Mathew
    • Tapas Kumar Mishra

    Original Paper 27 June 2020 Pages: 1953 - 1956

24. Generalized Power Sum and Newton-Girard Identities

    • Sudip Bera
    • Sajal Kumar Mukherjee

    Original Paper 17 August 2020 Pages: 1957 - 1964