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Degree theory. (English) Zbl 0367.47001
Cambridge Tracts in Mathematics. 73. Cambridge etc.: Cambridge University Press. X, 172 p. £8.50 (1978).

MSC:
47-01 Introductory exposition (textbooks, tutorial papers, etc.) pertaining to operator theory
47J05 Equations involving nonlinear operators (general)
55M25 Degree, winding number
47E05 General theory of ordinary differential operators