Dear Eckard,
You wrote: "Thank you for your hint to John Baez. Unfortunately, he is an overly prolific interpreter of sometimes rather unrealistic mathematics in terms of physics, and I did not yet find his "clarification" you are alluding to. Hopefully someone else can give me a clue. Is a Baez always correct?"
Most of the things he writes about, I can't understand anyway, but he has a fascination with Octonions, and that got my interest. I believe that the ad hoc invention of imaginary numbers in algebra, while useful in some ways, is counter-productive in the end, as particle theorists found out in SU3 studies, but, what I like to call the tetraktys, the binomial expansion, up to dimension 3, is key to understanding a true R3. Among other things, it has an inverse!
You wrote: "When you compared my essay with a whirlwind tour in a museum, I sadly did not reach you. I tried to investigate where mathematics started to become arbitrarily rather than logically founded."
Please don't misunderstand me. I did not mean your essay was museum-like. I meant that my reading of it was tour-like. My daughter is having her baby today and that's just one of many pressing things I have to attend to, which doesn't leave me enough time to study your essay, but I will! I read the two Joyce documents and can hardly wait to comment further.
You wrote: "I am not surprised that even the very cautiously thinking Ian Durham in his new essay ignored the possibility of mistakes when he wrote: "... while results from ... WMAP have demonstrated that the geometry of the universe must be flat ...and thus 'Eucildean,' we of course have long known that it is locally curved.""
In the new physical system of theory that I advocate, the major assumption is a space/time progression, but it included the assumption that the universe was flat and I had to defend that assumption vigorously. The WMAP news was very welcome on that score.
You wrote: "What about your multidimensional small-signal numbers I recall a Dutch outsider who seems to be close to your approach. I got aware of him when he was quoted from a participant of a previous FQXi contest. I also vaguely remember of a peculiarity in theory of acoustics waves: Solutions for even spatial dimensions (0, 2) behave differently from those for odd (1, 3) spatial dimensions. Did you know that?"
No, I do not know about that. I also don't know of the Dutch outsider you refer to.
I have to run now, but I will be back tomorrow. I just wanted to tell you how much I appreciate your knowledge of things and your belief and attitude toward things fundamental. I support your insistence on re-instating Euclid's view of number as measure and Peirce's view of the continuum as infinitely divisible, full heartedly.
Regards,
Doug