TY - JOUR A1 - Zheng, Xizhong T1 - Recursive approximability of real numbers KW - computable reals KW - semi-computable reals KW - weakly computable reals KW - recursively approximable realy Y1 - 2002 ER - TY - JOUR A1 - Zheng, Xizhong T1 - Closure properties on real numbers under limits and computable operators KW - weakly computable reals KW - computable real functions KW - closure properties Y1 - 2002 ER - TY - JOUR A1 - Rettinger, Robert A1 - Zheng, Xizhong A1 - Gengler, Romain A1 - Braunmühl, Burchard von T1 - Monotonically computable real numbers Y1 - 2002 ER - TY - GEN A1 - Zheng, Xizhong A1 - Rettinger, Robert A1 - Braunmühl, Burchard von T1 - Effectively absolute continuity and effective Jordan decomposability T2 - Electronic Notes in Theoretical Computer Science Y1 - 2002 SN - 1571-0661 N1 - Proceedings of CCA 2002, July 12 - 13, Malaga, Spain VL - 66 IS - 1 SP - 213 EP - 224 ER - TY - CHAP A1 - Rettinger, Robert A1 - Zheng, Xizhong A1 - Braunmühl, Burchard von ED - Oscar, H. Ibarra T1 - Computable Real Functions of Bounded Variation and semi-Computable Real Numbers T2 - Computing and combinatorics, 8th annual international conference, COCOON 2002, Singapore, August 15 - 17, 2002 Y1 - 2002 SN - 3-540-43996-X SP - 47 EP - 56 PB - Springer CY - Berlin [u.a.] ER - TY - RPRT A1 - Zheng, Xizhong A1 - Rettinger, Robert A1 - Braunmühl, Burchard von T1 - On the Jordan decomposability for computable functions of bounded variation KW - Jordansche Zerlegung KW - Zerlegung Y1 - 2002 PB - BTU, Inst. of Computer Science CY - Cottbus ER - TY - GEN A1 - Zheng, Xizhong A1 - Weihrauch, Klaus T1 - The arithmetical hierarchy of real numbers T2 - Mathematical Logic Quarterly Y1 - 2001 SN - 0942-5616 VL - 47 IS - 1 SP - 51 EP - 65 ER - TY - CHAP A1 - Rettinger, Robert A1 - Gengler, Romain A1 - Zheng, Xizhong A1 - Braunmühl, Burchard von T1 - Monotonically Computable Real Numbers T2 - Combinatorics, computability and logic, proceedings of the Third International Conference on Combinatorics, Computability and Logic, (DMTCS '01) Y1 - 2001 SN - 1-85233-526-2 SP - 187 EP - 202 PB - Springer CY - Berlin [u.a.] ER - TY - CHAP A1 - Rettinger, Robert A1 - Zheng, Xizhong T1 - Hierarchy of monotonically computable real numbers T2 - Mathematical foundations of computer science 2001, 26th international symposium, Mariánské Lázně, Czech Republic, August 27 - 31, 2001 Y1 - 2001 SN - 3-540-42496-2 SP - 633 EP - 644 PB - Springer CY - Berlin [u.a.] ER - TY - GEN A1 - Zheng, Xizhong A1 - Rettinger, Robert T1 - Effective Jordan decomposition T2 - Theory of Computing System Y1 - 2005 SN - 1432-4350 VL - 38 IS - 2 SP - 189 EP - 209 ER - TY - CHAP A1 - Rettinger, Robert A1 - Zheng, Xizhong ED - Cooper, Stuart Barry T1 - On the Turing degrees of divergence bounded computable reals T2 - New computational paradigms, First Conference on Computability in Europe, CiE 2005, Amsterdam, The Netherlands, June 8 - 12, 2005 Y1 - 2005 SN - 3-540-26179-6 SP - 418 EP - 428 PB - Springer CY - Berlin [u.a.] ER - TY - CHAP A1 - Zheng, Xizhong T1 - On the hierarchy of Delta_02-numbers Y1 - 2004 UR - http://www.informatik.uni-trier.de/Reports/TR-08-2004/rnc6_15_zheng.pdf ER - TY - CHAP A1 - Zheng, Xizhong A1 - Rettinger, Robert T1 - A note on the Turing degrees of divergence bounded computable reals Y1 - 2004 ER - TY - CHAP A1 - Zheng, Xizhong A1 - Rettinger, Robert T1 - On the extensions of Solovay Reducibility Y1 - 2004 ER - TY - CHAP A1 - Zheng, Xizhong A1 - Rettinger, Robert A1 - Gengler, Romain ED - Rovan, Branislav T1 - Ershov's hierarchy of real numbers T2 - Mathematical foundations of computer science 2003, 28th international symposium MFCS, Bratislava, Slovakia, August 25 - 29, 2003 Y1 - 2003 SN - 3-540-40671-9 SP - 681 EP - 690 PB - Springer CY - Berlin [u.a.] ER - TY - CHAP A1 - Zheng, Xizhong T1 - On the divergence bounded computable real numbers Y1 - 2003 ER - TY - CHAP A1 - Zheng, Xizhong A1 - Barmpalias, George T1 - On the monotonic computability of semi-computable real numbers Y1 - 2003 ER - TY - CHAP A1 - Zheng, Xizhong A1 - Rettinger, Robert A1 - Braunmühl, Burchard von T1 - On the effective Jordan decomposability Y1 - 2003 ER - TY - CHAP A1 - Rettinger, Robert A1 - Zheng, Xizhong A1 - Gengler, Romain A1 - Braunmühl, Burchard von T1 - Weakly computable real numbers and total computable real functions Y1 - 2001 ER - TY - JOUR A1 - Zheng, Xizhong A1 - Rettinger, Robert A1 - Barmpalias, George T1 - h-Monotonically computable real numbers JF - Mathematical Logic Quarterly Y1 - 2005 SN - 0942-5616 VL - 51 IS - 2 SP - 157 EP - 170 ER -