Stefan Rönn Title: Two complex pair algebras Abstract: We present the algebras of quaternions and bicomplex numbers using pairs of complex numbers (complex pairs). Especially the quaternions have applications in graphical data processing, while the bicomplex numbers are of interest from a function theoretic viewpoint. Both types of numbers can be seen as generalizations of the ordinary complex numbers, but in the process of generalization algebraic properties are lost. In quaternionic algebra the multiplication operation is non-commutative and in bicomplex algebra one has an infinite set of so-called singular bicomplex numbers, which lack an inverse. We focus in particular on the following issues: representations of quaternions and bicomplex numbers, basic algebraic properties, conjugations, norms, inverses and division operations. Reference: Rönn S 2001, "Bicomplex algebra and function theory", arXiv:math.CV/0101200