Unformatted text preview: the zero vector does not have a welldeFned direction —a feature which will be important to remember in the future. From a formal, algebraic point of view, the zero vector plays the role for vector addition that is played by the number zero for addition of numbers : it is an additive identity element , which means that adding it to any vector gives back that vector: −→ v + −→ 0 = −→ v = −→ 0 + −→ v . A ±nal feature that is brought out by thinking of vectors in R 3 as triples of numbers is that we can recover the entries of a vector geometrically. Note...
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 Fall '08
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 Calculus, Addition, Vectors, Scalar, additive inverse, arbitrary vector

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