Mathematics – Logic
Scientific paper
2006-02-22
Mathematics
Logic
33 pages
Scientific paper
We investigate various strong notions of rigidity for Souslin trees,
separating them under Diamond into a hierarchy. Applying our methods to the
automorphism tower problem in group theory, we show under Diamond that there is
a group whose automorphism tower is highly malleable by forcing.
Fuchs Gunter
Hamkins Joel David
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