Linear combinations, span, and basis vectors | Chapter 2, Essence of linear algebra

The fundamental concepts of span, linear combinations, linear dependence, and bases.
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Thanks to Elo Marie Viennot and Ambros Gleixner from HTW Berlin (www.htw-berlin.de) for contributing German translations and dubbing.

Thanks to these viewers for their contributions to translations
Arabic: @Cewkins, Hazem
Hebrew: Omer Tuchfeld
Spanish: Juan Carlos Largo
Vietnamese: @ngvutuan2811

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