orientation-reversing
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1: 1.6 Vectors and Vector-Valued Functions
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►If and , then the reparametrization is orientation-reversing and
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►A parametrization of an oriented surface is orientation preserving if has the same direction as the chosen normal at each point of , otherwise it is orientation reversing.
►If and are both orientation preserving or both orientation reversing parametrizations of defined on open sets and respectively, then
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