Peter Krautzberger on the web

Red workbook, p6


red workbook, p6-1
Red Workbook, p.6, part 1
red workbook, p6-2
Red Workbook, p.6, part 2


partial Translation


This is a curious (double) page. I don’t know why Sabine Koppelberg thought it was important to add the observation that the set of central sets of \omega is analytic (and I’m wondering if the question about “properly analytic” came from my PhD-sibling Gido Scharfenberger-Fabian). I don’t think I’ve ever seen this fact used in the wild. It is a nice observation though and lets me add the first entry in this transcription project with the following subsection:

Open problems