1. Global Chang’s Conjecture and singular cardinals

   • Monroe Eskew
   • Yair Hayut

   Research Article Open access 24 March 2021 Pages: 435 - 463

2. Big and little Lipschitz one sets

   • Zoltán Buczolich
   • Bruce Hanson
   • Gáspár Vértesy

   Research Article Open access 09 April 2021 Pages: 464 - 488

   

3. The Deligne–Illusie Theorem and exceptional Enriques surfaces

   • Stefan Schröer

   Research Article 02 March 2021 Pages: 489 - 525

4. Semistable sheaves with symmetric \(c_{1}\) on Del Pezzo surfaces of degree 5 and 6

   • Takeshi Abe

   Research Article 08 January 2021 Pages: 526 - 556

   

5. Moduli of double covers and degree one del Pezzo surfaces

   • Kenneth Ascher
   • Dori Bejleri

   Research Article 16 October 2020 Pages: 557 - 569

   

6. Unexpected surfaces singular on lines in \({\mathbb {P}}^{3}\)

   • Marcin Dumnicki
   • Brian Harbourne
   • Halszka Tutaj-Gasińska

   Research Article Open access 17 November 2020 Pages: 570 - 590

   

7. Finite groups acting on Severi–Brauer surfaces

   • Constantin Shramov

   Research Article 04 February 2021 Pages: 591 - 612

8. Varieties of planes on intersections of three quadrics

   • Brendan Hassett
   • Yuri Tschinkel

   Research Article 04 September 2020 Pages: 613 - 632

9. Stability of the Poincaré bundle

   • Indranil Biswas
   • Tomás L. Gómez
   • Norbert Hoffmann

   Research Article 06 January 2021 Pages: 633 - 640

10. Bimeromorphic automorphism groups of certain \(\pmb {{\mathbb {P}}^{1}}\)-bundles

    • Tatiana Bandman
    • Yuri G. Zarhin

    Research Article 08 October 2020 Pages: 641 - 670

11. Homotopy limits in the category of dg-categories in terms of \( \mathrm {A}_{\infty } \)-comodules

    • Sergey Arkhipov
    • Sebastian Ørsted

    Research Article 10 March 2021 Pages: 671 - 705

    

12. Equivariant quantum differential equation, Stokes bases, and K-theory for a projective space

    • Vitaly Tarasov
    • Alexander Varchenko

    Research Article 02 March 2021 Pages: 706 - 728

13. Classification of holomorphic Pfaff systems on Hopf manifolds

    • Maurício Corrêa
    • Antonio M. Ferreira
    • Misha Verbitsky

    Research Article 08 January 2021 Pages: 729 - 740

14. Variational symmetries and pluri-Lagrangian structures for integrable hierarchies of PDEs

    • Matteo Petrera
    • Mats Vermeeren

    Research Article Open access 09 November 2020 Pages: 741 - 765

15. Cut and pendant vertices and the number of connected induced subgraphs of a graph

    • Audace A. V. Dossou-Olory

    Research Article 11 January 2021 Pages: 766 - 792

    

16. Recurrence equation and integral representation of Apéry sums

    • Michael Uhl

    Research Article Open access 30 June 2020 Pages: 793 - 806