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, and check out our award-winning tablets and ereaders, including NOOK Tablet 7" and NOOK GlowLight Plus . © 2017 SparkNotes LLC , All Rights Reserved vector in two dimensions can be characterized by a single angle θ (see ); the direction of a vector in three dimensions can be specified using two angles (usually denoted θ and μ ). While these ideas are perfectly valid in our case (since we're dealing with vectors in finite-dimensional Euclidean space) it is not a good idea to become too a " ached to the notions of "direction" and "magnitude" for vectors. For instance, in quantum mechanics vectors o ! en come in the form of functions (for instance, a particle wave function), and in such a case it doesn't make sense to talk about the "direction" of the vector. We don't have to worry about these complications for now, though, and in the following SparkNote we will rely heavily on basic geometric notions when we discuss vector addition and multiplication. Prev Section Next Section you think about Valentines from fictional charac Will you be sing forever? (Yes.) F out with your February Love-o Scope! QUIZ: Which Jan Austen suitor should you date
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