1. Full q-Analogue for an Identity of \(\lambda \)-Extended Catalan Numbers

   • Xiaojing Chen
   • Wenchang Chu

   OriginalPaper 11 June 2020 Pages: 461 - 465

2. Bounds on Signless Laplacian Eigenvalues of Hamiltonian Graphs

   • Milica Anđelić
   • Tamara Koledin
   • Zoran Stanić

   OriginalPaper 16 June 2020 Pages: 467 - 476

3. Cayley–Bacharach and Singularities of Foliations

   • Antonio Campillo
   • Jorge Olivares

   OriginalPaper 19 June 2020 Pages: 477 - 498

4. Polytope Duality for Families of K3 Surfaces and Coupling

   • Makiko Mase

   OriginalPaper Open access 24 June 2020 Pages: 499 - 536

5. Einstein Hypersurfaces of \(\mathbb {S}^n \times \mathbb {R}\) and \(\mathbb {H}^n \times \mathbb {R}\)

   • Benedito Leandro
   • Romildo Pina
   • João Paulo dos Santos

   OriginalPaper 30 June 2020 Pages: 537 - 546

6. Generic Geometry of Stable Maps of 3-Manifolds into \({\mathbb {R}}^4\)

   • C. Casonatto
   • M. C. Romero Fuster
   • R. Wik Atique

   OriginalPaper 24 June 2020 Pages: 547 - 561

7. Exceptional Algebraic Sets for Infinite Discrete Groups of \(PSL(3,\mathbb {C})\)

   • Luis Loeza
   • Angel Cano

   OriginalPaper 29 June 2020 Pages: 563 - 572

8. Infinitesimal Variations of Submanifolds

   • Marcos Dajczer
   • Miguel Ibieta Jimenez

   OriginalPaper 16 July 2020 Pages: 573 - 589

9. Cross-Ratio Invariants for Surfaces in 4-Space

   • Jorge Luiz Deolindo-Silva

   OriginalPaper 22 July 2020 Pages: 591 - 612

   

10. Height Estimates for Bianchi Groups

    • Cayo Dória
    • Gisele Teixeira Paula

    OriginalPaper 23 July 2020 Pages: 613 - 627

11. Properties and \({\mathcal {M}}_p\)-supplemented subgroups of finite groups

    • Donglin Lei
    • Xianhua Li

    OriginalPaper 27 July 2020 Pages: 629 - 644

    

12. Geometry of the Stable Ruled Surface Over an Elliptic Curve

    • Arame Diaw

    OriginalPaper Open access 03 August 2020 Pages: 645 - 662

    

13. On Invariants of Generic Slices of Weighted Homogeneous Corank 1 Map Germs from the Plane to 3-Space

    • O. N. Silva

    OriginalPaper 29 July 2020 Pages: 663 - 677

    

14. Abel–Prym Maps for Isotypical Components of Jacobians

    • Juliana Coelho
    • Kelyane Abreu

    OriginalPaper 04 September 2020 Pages: 679 - 695

15. A Functorial Approach to Gabriel k-quiver Constructions for Coalgebras and Pseudocompact Algebras

    • Kostiantyn Iusenko
    • John William MacQuarrie
    • Samuel Quirino

    OriginalPaper 19 September 2020 Pages: 697 - 719

16. Expanding Metrics for Unicritical Semihyperbolic Polynomials

    • Lukas Geyer

    OriginalPaper 01 August 2020 Pages: 721 - 737

    

17. Milnor–Hamm Fibration for Mixed Maps

    • Maico F. Ribeiro
    • Antonio A. do Espírito Santo
    • Fernando P. P. Reis

    OriginalPaper 29 August 2020 Pages: 739 - 766

    

18. Correction to: A Family of Foliations with One Singularity

    • S. C. Coutinho
    • Filipe Ramos Ferreira

    Correction 06 July 2020 Pages: 767 - 769