Supported by the NNSF of China(Grant Nos.11761029,11461049,11371185,11661034 and 11761055);the NSF of Inner Mongolia(Grant No.2017MS0123);the key Science and Technology Program of Colleges and Universities of Inner Mogolia(Grant No.NJZY17234)
Numerical range has an important applications on spectrum distribution of operators. In this paper, we devoted to characterizing operators whose numerical range contains the origin. Some necessary and sufficient condi...
supported by the National Natural Science Foundation of China(Grant Nos.11101200 and 11371185);the Natural Science Foundation of Inner Mongolia Autonomous Region,China(Grant No.2013ZD01)
In this paper, the ascent of 2 × 2 infinite dimensional Hamiltonian operators and a class of 4 × 4 infinite dimensional Hamiltonian operators are studied, and the conditions under which the ascent of 2 × 2 infinite...