Theory of index and a generalized Nyquist criterion. (English) Zbl 0453.57015
MSC:
57R25 | Vector fields, frame fields in differential topology |
30D35 | Value distribution of meromorphic functions of one complex variable, Nevanlinna theory |
32H30 | Value distribution theory in higher dimensions |
37C25 | Fixed points and periodic points of dynamical systems; fixed-point index theory; local dynamics |
55M25 | Degree, winding number |