Relativistic Addition of Velocities in R5

Another method of adding relativistic velocities is shown. It uses a fifth dimension of spacetime rotating the coordinate system of the Minkowski diagram into it and thus is an indication of the existence of a fifth dimension. As proof of correctness of the result of the rotation the addition theorem of velocities is derived from it. Photographs of a hardware model and diagrams of a computergenerated model illustrate how to find the resulting velocity by the rotation into the five-dimensional spacetime. Alongside the paradox  "c + u´ = c"  is resolved.

Content:
1. Introduction
2. The rotation angle
3. Proof of the procedure
4. Examples
5. Resolution of the paradox  "c + u´ = c"
6. Summary