The following are important identities in vector algebra. Identities that only involve the magnitude of a vector and the dot product (scalar product) of two vectors A·B, apply to vectors in any dimension, while identities that use the cross product (vector product) A×B only apply in three dimensions, since the cross product is only defined there.[nb 1][1] Most of these relations can be dated to founder of vector calculus Josiah Willard Gibbs, if not earlier.[2]
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