Authors: Živaljević, Rade 
Affiliations: Mathematical Institute of the Serbian Academy of Sciences and Arts 
Title: Let’s get acquainted with mapping degree!
Journal: Teaching of Mathematics
Volume: 14
Issue: 2
First page: 119
Last page: 136
Issue Date: 1-Jan-2011
ISSN: 1451-4966
Given a continuous map f: M → N between oriented manifolds of the same dimension, the associated degree deg(f) is an integer which evaluates the number of times the domain manifold M “wraps around” the range manifold N under the mapping f. The mapping degree is met at almost every corner of mathematics. Some of its avatars, pseudonyms, or close relatives are “winding number”, “index of a vector field”, “multiplicity of a zero”, “Milnor number of a singularity”, “degree of a variety”, “incidence numbers of cells in a CW-complex”, etc. We review some examples and applications involving this important invariant. One of emerging guiding principles, useful for a mathematical student or teacher, is that the study of mathematical concepts which transcend the boundaries between different mathematical disciplines should receive a special attention in mathematical (self)education.
Keywords: Mapping degree | Winding number
Publisher: Društvo Matematičara Srbije

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