Tag Archives: quaternions

Complexification of a Real Krein Space. Part I

Posted on 2026/06/01 by arkajad

Introduction There is a rather unusual journal called the Journal of Humanistic Mathematics. It aims to provide an open forum for academic and informal discussions of the “human face of mathematics,” focusing on aesthetic, cultural, historical, literary, pedagogical, philosophical, psychological, … Continue reading →

Posted in Functional analysis, Krein spaces, Linear Algebra, Lorentz transforations, Quaternions, Special relativity | Tagged , , , , | 6 Comments

Dzhanibekov effect – Part 2

Posted on 2017/01/05 by arkajad

“Everything is repeated, in a circle. History is a master because it teaches us that it doesn’t exist. It’s the permutations that matter.” So wrote Umberto Eco in his Focault’s Pendulum. Somehow we, humans, are helping these repetitions to happen. … Continue reading →

Posted in Quaternions, Stereographic projection | Tagged , , , , , | 8 Comments

Dzhanibekov effect – Part 1

Posted on 2017/01/04 by arkajad

Restarting my blog I am inviting you on the board of Salyut 7 in 1985. Vladimir Dzhanibekov, Russian cosmonaut from Uzbekistan. From Wikipedia: Dzhanibekov made five flights: Soyuz 27, Soyuz 39, Soyuz T-6, Soyuz T-12 and Soyuz T-13. In all … Continue reading →

Posted in Dzhanibekov effect, Quaternions | Tagged , , | 3 Comments