We argue that the geometry of spacetime is a convention that can be freely chosen by the scientist; no experiment can ever determine this geometry of spacetime, only the behavior of matter in space and time. General relativity is then rewritten in terms of an arbitrary conventional geometry of spacetime in which particle trajectories are determined by forces in that geometry, and the forces determined by fields produced by sources in that geometry. As an example, we consider radial trajectories in (...) the field of a single particle expressed in the spacetime of special relativity. (shrink)

Martin Luther and doing theology in the future. The Netherdutch Reformed Church of Africa prides itself for the fact that she has always appreciated the German-Lutheran tradition. The Reformed Theological College has for 15 years contributed to the appreciation of this tradition. This article wants to encourage the new leadership to keep this legacy alive. The main aspects of Luther’s theology are explained. These aspects are: prayer, meditation, constitation, grace of the Spirit, exegesis, and the use of other sciences in (...) understanding the Bible. Attention is also given to the subject-matter of Theology as well as the notion of humbleness. (shrink)

The phenomenological calculus is a relational paradigm for complex systems, closely related in substance and spirit to Robert Rosen’s own approach. Its mathematical language is multilinear algebra. The epistemological exploration continues in this paper, with the expansion of the phenomenological calculus into the realm of anisotropy.