Scientific interests:

• Banach space theory, especially:
  • combinatorial methods in Banach spaces
  • twisted sums
  • vector measures
  • generalised bases
• Banach algebras, including:
  • operator algebras and their ideals
  • C*-algebras, von Neumann algebras
• Functional equations and inequalities, especially:
  • Hyers-Ulam stability
  • functional equations in number theory