1. Coalition and Relativised Group Announcement Logic

   • Rustam Galimullin

   OriginalPaper 03 January 2021 Pages: 451 - 489

   

2. Modal and Intuitionistic Variants of Extended Belnap–Dunn Logic with Classical Negation

   • Norihiro Kamide

   OriginalPaper 09 April 2021 Pages: 491 - 531

3. A Class of Implicative Expansions of Kleene’s Strong Logic, a Subclass of Which Is Shown Functionally Complete Via the Precompleteness of Łukasiewicz’s 3-Valued Logic Ł3

   • Gemma Robles
   • José M. Méndez

   OriginalPaper 16 May 2021 Pages: 533 - 556

   

4. Evaluating Free Rides and Observational Advantages in Set Visualizations

   • Andrew Blake
   • Gem Stapleton
   • Anestis Touloumis

   OriginalPaper Open access 15 April 2021 Pages: 557 - 600

   

5. Natural Deduction Bottom Up

   • Ernst Zimmermann

   OriginalPaper Open access 16 March 2021 Pages: 601 - 631

   

6. Book Review

   • Thomas Grano

   ReviewPaper 06 July 2021 Pages: 633 - 656