Abstract
In this chapter we introduce some notation and definitions that we will need later on.
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Artés, J.C., Llibre, J., Rezende, A.C. (2018). Preliminary Definitions. In: Structurally Unstable Quadratic Vector Fields of Codimension One. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-92117-4_2
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DOI: https://doi.org/10.1007/978-3-319-92117-4_2
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