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78 PETER KOEPKE
[6] Thomas Jech. Set Theory. The Third Millennium Edition. Springer Mono- graphs in Mathematics. Springer-Verlag, 2003.
[7] Peter Koepke. Turing computations on ordinals. Bull. Symbolic Logic, 11(3):377–397, 2005.
Mathematisches Institut, Universita¨t Bonn Beringstrasse 1, D-53115 Bonn, Germany E-mail address: koepke@math.uni-bonn.de
