issue 04 publication date 2018-11-01

• A new type of Hyers-Ulam-Rassias stability for Drygas functional equation
• Linear v{C}ech closure spaces
• A note on spectral mapping theorem
• Algebraic distance in algebraic cone metric spaces and its properties
• On a new type of stability of a radical cubic functional equation related to Jensen mapping
• Digital cohomology groups of certain minimal surfaces
• On the solving matrix equations by using the spectral representation