论文部分内容阅读
It is proved that for any r.e. degrees v【u, there exists a properly d-r. e. degree c such that c is a branching degree and v【c【u.
The weak density of properly d-r.e. branching degree in the d-r.e. degrees
【摘 要】
：
It is proved that for any r.e. degrees v【u, there exists a properly d-r. e. degree c such that c is a branching degree and v【c【u.
【机 构】
：
1.DepartmentofMathematics
【出 处】
：
中国科学：数学英文版
【发表日期】
：
1999年7期
【基金项目】
：
Project supported by the National Natural Science Foundation of China (Grant No. 19771045), National 863 Hi-Tech R&D Programme.
其他文献
Preparation and third-order nonlinear optical properties of self-organized complex oxide Ce: BaTiO&l
Pulsed laser ablation epitaxial Strancky-Krastanow growth of self-organized complex oxide Ce:BaTiO3 quantum dots on MgO(100) substrates is demonstrated. Atomic
Structure and prime decomposition law and relative extensions of abelian fields with prime power deg
Let L be an abelian extension of the rationals Q whose Galois group Gal(L) is an abelian (q-group q is any prime number). The explicit law of prime decompositio
Optical diagnostics of evolution of plasmas produced by ultrashort laser pulses is carried out using a femtosecond probing beam. The time sequence of plasma sha
A general result is obtained which relates the entropy numbers of compact maps on Hilbert space to its approximation numbers. Compared with previous works in th
A robust version of local linear regression smoothers augmented with variable bandwidth is studied. The proposed method inherits the advantages of local polynom
For classical orthogonal projection methods for large matrix eigenproblems, it may be much more difficult for a Ritz vector to converge than for its correspondi
The composite films of GaSb nanoparticles embedded in SiO2 matrices were fabricated by radio-frequency magnetron co-sputtering. Transmission electron microscope
The arteries can remodel their structure and function to adapt themselves to the mechanical environment. In various factors that lead to vascular remodeling, th
It is proved that the exact Borel subalgebras of a basic quasi-hereditary algebra are conjugate to each other. Moreover, the inner automorphism group of a basic
Measurements of the VLBI experiments during the first campaign of the Asian-Pacific space geodynamic
During the first campaign of the Asian-Pacific space geodynamics(APSG) program in October 1997, two VLBI experiments were successfully organized and coordinated