Peter Krautzberger on the web

Red workbook, p15

Source

red workbook, p15-1
Red Workbook, p.15, part 1
red workbook, p15-2
Red Workbook, p.15, part 2

Transcript

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partial Translation

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Notes

We’re getting to some serious results here. The “tree characterization” of centrality is, I think, not known (or not appreciated) widely enough. It might be a lot to wrap your mind around as a student but this might be one of the better ways of providing some insights into the notion of cwpws sets.

This page is very amusing. The random note on destroying strongly summable ultrafilters is what occupied a large part of my postdoctoral research. Apparently it took me a while to realize this is an interesting question. Come to think of it, Francois and I also spent quite a bit of time on the tree characterization; makes me want to skip ahead to a postdoc notebook…