1. Kleene algebras with implication

   • José Luis Castiglioni
   • Sergio Arturo Celani
   • Hernán Javier San Martín

   OriginalPaper 10 February 2017 Pages: 375 - 393

2. On the varieties of ai-semirings satisfying \({x^{3}\approx x}\)

   • Miao Miao Ren
   • Xian Zhong Zhao
   • Ai Fa Wang

   OriginalPaper 31 March 2017 Pages: 395 - 408

3. Localic subspaces and colimits of localic spaces

   • Niels Schwartz

   OriginalPaper 31 March 2017 Pages: 409 - 442

4. Diagrams and rectangular extensions of planar semimodular lattices

   • Gábor Czédli

   OriginalPaper 31 March 2017 Pages: 443 - 498