@article{Zheng, author = {Zheng, Xizhong}, title = {On the Hierarchies of Delta 0_2 real Numbers}, language = {en} } @article{DowneyWuZheng, author = {Downey, Rod and Wu, D. and Zheng, Xizhong}, title = {Degrees of d.c.e. Reals}, language = {en} } @phdthesis{Zheng, author = {Zheng, Xizhong}, title = {Effective Hierarchy of Real Numbers}, publisher = {Shaker}, address = {Aachen}, isbn = {978-3-8322-6343-0}, pages = {X, 244}, language = {en} } @incollection{Zheng, author = {Zheng, Xizhong}, title = {Bounded Computable Enumerability and Hierarchy of Computably Enumerable Reals}, language = {en} } @inproceedings{Zheng, author = {Zheng, Xizhong}, title = {A Computability Theory of Real Numbers}, series = {CCA 2008, August 21 - 24, 2008, Hagen, Germany}, booktitle = {CCA 2008, August 21 - 24, 2008, Hagen, Germany}, editor = {Brattka, Vasco}, publisher = {Hagen}, address = {Fernuniv.}, language = {en} } @inproceedings{RettingerZheng, author = {Rettinger, Robert and Zheng, Xizhong}, title = {Points on Computable Curves of Computable Lengths}, language = {en} } @inproceedings{RettingerZheng, author = {Rettinger, Robert and Zheng, Xizhong}, title = {On the Computability of the Rectifiable Simple Curves}, language = {en} } @article{Zheng, author = {Zheng, Xizhong}, title = {Classification of Computably Approximable Real Numbers}, language = {en} } @article{Zheng, author = {Zheng, Xizhong}, title = {A Hierarchy of Computably Enumerable Reals}, language = {en} }