Algebra of Noncommutative Riemann Surfaces
  We examine several algebraic properties of the noncommutive $z$-plane and Riemann surfaces. The starting point of our investigation is a two-dimensional noncommutative field theory, and the framework of the theory will be converted into that of a complex coordinate system. The basis of noncommutative complex analysis is obtained thoroughly, and the considerations on functional analysis are also given before performing the examination of the conformal mapping and the Teichm\"{u}ller theory. (Keywords; Complex Analysis, Riemann Surfaces and Teichm\"{u}ller Space, Functional Analysis, Deformation Quantization, Non-Commutative Geometry, Quantum Groups) 
Tadafumi Ohsaku